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NWSP 90.1 Stiffness (Cantilever)

Standard:

NWSP

Method:

NWSP 90.1

Title:

Stiffness of Nonwoven Fabrics Using the Cantilever Test

Scope

The NWSP 90.1 Stiffness test method covers stiffness properties of nonwoven fabrics by employing the principle of cantilever bending of the fabric under its own weight. Bending length is measured and flexural rigidity calculated.

This test method applies to most nonwoven fabrics that are treated or untreated, including those that are heavily sized, coated, or resin-treated.

The SI values are regarded as the official standard system of measurement for this standard test method. If other systems of measurement are used in place of SI units (including inch-pound) their values must be reported independently. Systems of measurement must not be combined in any way, but shall be regarded and reported separately.

Principle

A specimen is slid in a direction parallel to its long dimension at a specified rate (motorized specimen feed is set for 120 mm/min), so its leading edge projects from the edge of a horizontal surface. The length of the overhang is measured when the tip of the specimen is depressed under its own weight to the point where the line joining the top to the edge of the platform makes a 0.785 rad (41.5┬░) angle with the horizontal. The stiffer the fabric, the longer it takes to bend, thus, higher numbers indicate a stiffer fabric.
This test method measures the drape stiffness of the nonwoven fabric. This test is not, however, suitable for very limp fabrics or those that show a marked tendency to curl or twist.

 

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