GM-9149P-1988.pdf
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1、9006379 00001/4 4bb El GENERAL MOTORS ENGINEERING STANDARDS Materials and Processes - Procedures STITCH TEAR RESISTANCE OF VINYL COATED GENUINE LEATHER GM9149P 1 SCOPE. This procedure is used to determine the stitch tear resistance of genuine leather, hand buff and full top grain (milled). 2 EQUIPME
2、NT REQUIRED. 2.1 A tensile testing machine conforming to the require- ments of the standard specifications for textile testing ma- chines, ASTM D76, shall be used. The machine shall be of the constant rate of traverse or the constant rate of extension class and shall be so operated that the pulling
3、clamps have a uniform speed of 300 f 12 mm/minute. The face of one jaw of the clamp shall measure 25 mm; that of the other jaw of this clamp, 25 x 50 mm or more. The other clamp shall be of the self-closing type with a knurled circumference. The roll shall be eccentric. 2.2 A piece of soft wire 50 +
4、 0.127 mm in diameter and 100 to 125 mm long. A good source of wire of this size is the NO. 1 Gem paper clip. A new wire shall be used for each test. 2.3 Two #23 needles as used on sewing machines in production for sewing leathers. 2.4 A 6.35 mm gauge needle holder (#223878). Available from: Singer
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