| 摘要 |
A composite expanded sheet reinforcing material especially useful as a stiffening, vibration and sound dampening, reinforcing laminate, and methods of manufacturing such sheet reinforcing material and of reinforcing articles therewith are disclosed. Formable sheet material having a layer of a foamable adhesive laminated thereon is passed through an expanding apparatus which forms rows of spaced, longitudinally staggered slits through the laminated sheet to form a series of elongated strands integrally joined at their ends by a series of joints or bonds. The slit material is expanded in a direction transverse to the longitudinal direction of the slits, causing the adhesive-coated surfaces of the strands and joints to be inclined at an acute angle to the principal plane of the formed reinforcing sheet. The formed reinforcing sheet may then be laminated onto a surface which is to be reinforced by placing the adhesive-coated surface of the strands and joints in juxtaposed relation to the surface and activating the adhesive.
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