Minimizing Read-Through when Creating a Mechanical Score in a Polymer Skin

Document Number: 2007-01-1220

Date Published: April 2007

Author(s):
Kevin Cox - Automotive Components Holding, LLC
Richard E. Robertson - Univ. of Michigan

Abstract:
When weakening a skin/foam bilaminate by mechanically scoring the polymer skin on its back surface, where it is bonded to the foam, the weakness of the bilaminate is determined by the depth of the score groove. The deeper the groove, the weaker the bilaminate. But also, the deeper the groove, the greater the tendency for read-through. Read-through is seeing on the front surface the location of this groove that was created on the back surface. Scored skins, after mounting flat on a glass plate, were viewed with an optical interferometer. It was found that the topographical feature that constituted read-through was a valley. A Silly Putty model was used to better understand the strains induced by mechanical scoring and this understanding was used to identify factors affecting read-through. Blade thickness and the ultimate elongation of the skin material were identified as factors. This work is applicable to certain types of passenger-side seamless airbag systems, for example.

File Size: 1281K
Product Status: In Stock

Included in: V116-5

See other papers presented at SAE World Congress & Exhibition, April 2007, Detroit, MI, USA, Session: Advances in Instrument Panels and Interiors (Part 1 of 2)

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