江苏高考作文题目
Standard Test Method for
Electrostatic Decay of Nonwoven Fabrics
A number in Parenthes indicates the year of last revision.
1. Scope
1.1 This method determines the electrostatic properties of a material in film or sheet form by measuring the time required to dissipate a charge from the surface of the material.
2. Referenced Documents
2.1 ASTM Standards:
D 123 Terminology Relating to Textiles 1
D 1776 Practice for Conditioning Textiles for
Testing 1
2.1 Other Standards:
翩翩年少
NFPA-99-92 Sec. 12-4.1.3.8(f) (3) 2
Federal Test Method STD No. 101C, Method
4046, Electrostatic Properties of Materials 33
Terminology 3.1 Definitions :
3.1.1 electrostatic decay , n – the ability of a
material when grounded to dissipate a charge which has been induced on the surface of the material.
3.1.2 decay time , n – the time in conds for the induced charge to dissipate to 10% of its original level.
4. Summary of the Method
4.1 A flat sheet material is tested to determine its ability to dissipate an electrostatic charge by mounting samples of the material, subquently charging the material to 5000V and then timing the charge dissipation.
5. Significance and U
5.1 F abrics, films, nonwovens, or other materials which may be ud in situations where electrostatic charge is objectionable may be tested using this method. The situations may be safety related such as u around flammable materials or practical such as handling the fabric or film on automated equipment.
6. Apparatus
6.1 Static Decay Meter (1) – The static decay南海泡沫事件
meter shall be capable of imparting a high voltage charge of at least 5000 volts positive and negative, and have a voltmeter and time capable of measuring the charge and timing its decay to a prent limit. The meter should be equipped with a t of electrodes capable of supporting samples 89 x 140 mm (3.5 x 5.5in.) and making good electrical contact.
6.2 Gloves – latex or cotton knit gloves which will prevent contamination of fabric surfaces.
烤猪腿7. Sampling, Test Specimens and Test Units
7.1 Take the bulk and laboratory samples
according to any applicable material specifications, or in their abnce, take the laboratory sample in such a manner that it is reprentative of the lot to be tested.7.2 Take no specimen nearer the edge than 1/10 the width of the fabric.
7.3 Five specimens should be taken in each direction per sample.
7.4 If it is determined that a significant difference in performance exists between face and back then a double t of specimens should be run to evaluate performance of each surface.
8. Preparation of Apparatus
8.1 The test unit should be installed in a
conditioned environment identical to the environment ud to condition the specimens.查询对方手机位置
8.2 The apparatus should be turned on and
“warmed-up” for at least 30 minutes prior to calibration or testing.
三国时期是什么朝代
8.3 Calibrate the instrument using manufacturers instructions for the unit. This calibration should b
e done daily or alternately, prior to each round of testing.Calibration results should be recorded as part of a total quality system.
8.4 Be sure the instrument is clean, and that the cut-off switch for the timer is t properly.
8.5 Be sure the instrument is clean, and that the cutoff switch for the timer is t properly.
9. Conditioning
9.1 Samples should be conditioned at 50% R.H.and 23 ° + 1°C for 24 hours prior to testing. Testing should be carried out at the conditions. Samples should be expod to the conditions following guidelines in ASTM D 1776.
9.2 Other conditions may be required by product specifications and or standards. If test conditions are different from tho mentioned above the results are not in compliance with NFPA 99. The conditions should be reported along with the test results.
9.3 \\\\\\\
INDA, Association of the Nonwoven Fabrics Industry
1300 Crescent Green, Suite 135
Cary, NC 27512
Copyright 2001, INDA
1 Annual Book of ASTM Standards
, Vol. 07.01.
2
National Fire Protection Association, 1 Batterymarch Park
P.O. Box 9101, Quincy, MA 02269-9101.3
General Services Administration Building 197, Washington Navy
Yard, Washington, DC 20407.
®
STANDARD TEST: IST 40.2 (01)
10.Preparation of Specimens
10.1 Prepare the MD and CD specimens by
die or scissor cutting to the dimensions specified in Section 6.1, being careful not to contaminate the specimens during handling.
11.Procedure
11.1Turn the test device on and allow 30 minutes to warm up.
11.2 Depress Zero/Standard switch. Be sure cut-off tting is on 10%. Sample charge meter should read 0.
11.3Calibrate the meter according to manufacture instructions.
11.4Set manual mode and t High Voltage to “off”.
11.5L oad the test sample into the electrodes. Be sure sample is straight and makes good contact at each point. Do not touch samples with ungloved hands.
11.6D epress charge button. If the sample registers
a charge, it may not be antistatic.
11.7D epress Hi Voltage (+) and adjust to 5KV.
11.8D epress Zero/STBY and adjust if necessary.
11.9Depress CHG Button. The sample charge meter should instantly move to full scale. If the sample-charging stop is slow the sample is probably not antistatic or is weakly antistatic.
11.10 Once charged full-scale (5KV) press the test button. Decay time will be displayed in conds. Record this value.
11.11Turn off high voltage. Remove sample.
11.12Repeat 11.7–11.11 for high voltage (-).
12.Calculation
泪潸潸
12.1 Calculate the average for each direction/face.
13. Report
13.1 Report both the average and individual maximum for each direction/face.
13.2I f the material is not chargeable, report at not chargeable, under this method.
13.3I f decay time exceeds one minute report as (> 1 min).
13.4R eport temperature and R.H. values for this test if they differ from tho specified.
14.Precision and Bias
14.1P recision – The precision of this method has
not been determined.
14.2 Bias – The accuracy of this test method is to
be determined.
15.Keywords
汉堡包英文怎么说15.1e lectrostatic decay, nonwoven fabrics, charge, dissipate NOTES
1. A suitable device for measuring electrostatic decay is available:
Electro-Tech Systems, Inc.
35 E Glenside Avenue
Glenside, PA 19038
Model 406 D Electro Static Decay Meter
For installations not equipped with a controlled environment the test may be done using a glove box. This apparatus is also available from Electro-Tech Systems.
Model 506 Chamber
Model 514 Humidity Controller
IST 40.2 (01)
