August 18, 2017
An Agricultural Research Service (ARS) scientist has discovered a way to find hidden defects in the animal hides that are eventually turned into footwear, sporting goods, fashion accessories and other leather goods.
About 90% of the 32 million hides produced by the U.S. meat industry each year are exported. Before they are sold in international markets, they are visually inspected, weighed and given a numeric grade. However, ARS said many hides have hidden defects caused by insect bites, abrasions, scars and natural rough spots.
Processing and selling animal hides is a $2 billion industry in the U.S., and the lack of any technology for measuring defects and characterizing quality often leads to disputes after the hides are sold, said Stephen Sothmann, president of the U.S. Hide, Skin & Leather Assn., which represents leather goods manufacturers and meat packers, processors and traders that export hides.
Cheng-Kung Liu, an ARS materials engineer in Wyndmoor, Pa., may have found a solution: the use of ultrasonic waves.
Ultrasonic waves are sound waves, and when they are transmitted through an object, defects or rough spots on the object's surface — even those that can't be seen by the naked eye — will change the intensity of the signal. Ultrasonic waves are now used to grade lumber and identify defects on aircraft parts, National Aeronautics & Space Administration technology and the surfaces of other precision materials, according to Liu.
An ultrasound scan image of a steer hide with a defect in the middle (defect in red). ARS scientists found that ultrasound scans reveal defects in the hides.
Liu scanned hides by sending low-frequency airborne ultrasonic signals through the hides to a receiver a few centimeters away. He collected enough data to accurately assess defects and predict the potential quality of the leather's toughness, strength, stiffness and other factors. The scans also did not cause any damage.
Because the equipment is based on commercially available technologies, Liu anticipates having a scanner available for industrial use in two to three years, ARS noted.
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