Patent ID: 6355132
Filing Date: 2002-03-12
Classification: B32B,E04D,Y10T

Abstract:
A method of continuously producing a plurality of laminated shingles comprising the steps of:(a) continuously advancing an indefinite length of a fibrous sheet, (b) waterproofing the sheet, (c) adhering granules to the upper surface of the sheet, (d) cutting and separating from the sheet at least three indefinitely long strips to form a wide elongate strip and at least two narrower elongate strips, (e) positioning and adhering a first of the narrower strips underneath and upon the wide sheet so that the longitudinal centerline of the first narrower strip is below and in the same vertical plane as the centerline of the wide strip, (f) positioning and adhering a second of the at least two narrower strips underneath and upon the first narrower strip so that the longitudinal centerline of the second narrower strip is below and in the same vertical plane as the centerline of the first narrower strip, (g) optionally cutting another narrow strip or other narrow strips from the sheet during cutting in step (d) and then optionally positioning the another strip or other strips underneath and upon the last previously adhered narrow strip so that the longitudinal centerline of the another strip or the other strips is below and in the same vertical plane as the centerline of the last previously adhered narrow strip optionally positioning and adhering any other narrower strip or strips formed in step (d) underneath and upon the last previously adhered narrower strip so that the longitudinal centerline of any other narrower strip is below and in the same vertical plane as the centerline of the last previously adhered narrower strip, the adhered narrower strips and their overlying portion of the wide sheet thereby forming a multi-layered composite section, (h) making an elongate cut (i) alternately across and generally along the centerline and (ii) within the longitudinal side boundaries of the composite section to form a repeating pattern of interdigitated multi-layered tabs in the composite section, and (i) transversely cutting the two elongate composites formed in step (h) into preset lengths to form a plurality of shingles.