ASTM D2061 Fig.18 Test Fikstürü

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ASTM D2061 – Standard Test Methods for Strength Tests for Zippers

ASTM D2061 covers the determination of the strengths for zipper and zipper parts. All methods are not suitable for use with all kinds of zipper.

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ASTM D2061 / RESISTANCE TO TWIST OF PULL AND SLIDER

This test method covers the determination of the twist resistance of a pull-and-slider assembly against a torsional force applied to the pull of a zipper in a plane

perpendicular to its longitudinal axis.

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ASTM D2061 / Summary of Test Method

A fixture as shown in Fig. 18 is used with a torque wrench to apply a specified twisting force to a slider pull.

The amount of permanent twist imparted to the slider pull or other permanent damage or deformation is noted.

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ASTM D2061 / Significance and Use

Resistance to Twist of Pull and Slider—This test method may be used to determine slider pull strength which measures the ability of a slider pull or pull assembly,

either or both, to resist deformation or rupture when a torsional stress is applied on the pull during operation of the zipper in the end-product.

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ASTM D2061/ Apparatus

Pull Twist Test Fixture Assembly, consisting of a pull twist fixture having a means for positioning the slider body, and for clamping the pull perpendicularly to

the slider body as shown in Fig. 18.

The pull clamp shall be rotatable around its longitudinal axis and shall be equipped with a dial for measuring the angle of rotation.

Provision shall be made to apply torsional forces to the clamp by means of torque wrenches of the adjustable slip type at the rate of approximately 9°/s.

The wrench selected for each test shall be such that the torsional force exerted falls between 20 and 80 % of its scale capacity.

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Test Specimen

The test specimen shall consist of a complete pull-andslider assembly. Two specimens are required.

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ASTM D2061 / Procedure

Attach the slider in the pull twist test fixture.

Position the pull in the clamp, aligning the front surface of the clamp with the midpoint of the pull as shown in Fig. 18.

Turn the testing drum clockwise until the clearance between the lug and the pull trunnions is taken up, and then set the dial to zero.

Use the appropriate torque wrench and at the rate of approximately 9°/s apply the torsional force required by the applicable specification.

Release the torsional force.

Turn the testing drum by hand in the direction of the torsional force until the clearance is taken up.

Read the dial and record the amount of permanent twist. Remove the slider.

*** Before conducting ASTM D2061 , 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.