Method for applying granules to strip asphaltic roofing material to form variegated shingles

Abstract

A method and apparatus for applying granules to a coated asphalt sheet to form at high production speeds with shingles a variegated pattern having uniform pattern edges. Granules of a first color are applied to spaced first areas on a continuously moving tacky asphaltic strip, such as a hot asphalt coated organic or glass fiber mat. Hot asphalt or another adhesive is applied to at least a portion of one or both of the leading and trailing edges of the first areas to provide predetermined uniform edges to tacky second areas between the spaced first areas. Granules of a second color are then deposited on the second areas. The granule coated strip is then cut into shingles. The method may be used to create multiple pattern areas with two or more different colored granules or granule blends.

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