ASTM D4032 Test Fikstürü

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ASTM D4032 – Standard Test Method for Stiffness of Fabric by the Circular Bend Procedure

 

ASTM D4032 covers the determination of the stiffness of fabrics by the circular bend procedure.

This test method is generally applicable to all types of fabrics, including woven, knitted and nonwovens, of any fiber content.

NOTE 1—For other methods of testing for stiffness, refer to Test Methods ASTM D1388

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Significance and Use

Test Method ASTM D4032 for testing stiffness of fabrics is considered satisfactory for quality control testing.

It may also be used for acceptance testing of commercial shipments since the test method has been used extensively in the trade field.

The circular bend procedure gives a force value related to fabric stiffness, simultaneously averaging stiffness in all directions.

The stiffness tests in Test Methods ASTMD 1388 are of the single directional type.

The circular bend procedure is simple to perform and may be used for knitted, woven, or nonwoven fabrics, provided gage capacity is in keeping with fabric

range tested.

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ASTM D4032 / Summary of Test Method

A plunger forces a flat, folded swatch of fabric through an orifice in a platform.

The maximum force required to push the fabric through the orifice is an indication of the fabric stiffness (resistance to bending).

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ASTM D4032 /Apparatus

Circular Bend Stiffness Tester, having the following parts:

Platform, 102 by 102 by 6 mm (4 by 4 by 1⁄4 in.) smooth-polished chrome-plated steel plate with a 38.1-mm (1.50-in.) diameter orifice.

The lap edge of the orifice should be at a 45° angle to a depth of 4.8 mm (3⁄16 in.).

Plunger, 25.4-mm (1.00-in.) diameter, mounted concentric with orifice, 6.4 mm (0.25 in.) clearance on all sides.

The bottom of the plunger should be set at 3 mm (1⁄8 in.) above the top of the orifice plate.

From this position, the downward stroke length is 57 mm (21⁄4 in.).

Force-Measurement Gage, dial or digital type

Dial gages with maximum reading pointer in different capacities ranging from 1 to 50 lbf, 0.5 to 25 kgf, or 5 to 200 N with 100 graduations minimum; or

Digital gage with maximum reading “hold” feature and capacity of 100 lbf, 50 kgf, or 500 N, with 1000 graduations minimum.

Actuator, manual or pneumatic.

*** Before conducting ASTM D4032 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.