| 摘要 |
A fiberglass shingle produced from a mat having high tear resistance which comprises a base or sheet made of chopped glass fibers, bonded together by a bonding agent. Randomly oriented, substantially continuous fiberglass strands may be embedded and bonded in the base, the strands being separated by layers of base material. The mat may also have one or more separate layers of longitudinal, substantially continuous, fiberglass strands, which may generally either be straight or sinusoidal, bonded into the base material. If the mat is being produced to form a shingle, it may be provided with a relatively dense plurality of strengthening strands at predetermined intervals across the width of the mat. Such intervals may be determined by the ultimate shingle width desired so that the strengthening strands are located adjacent the inner ends of the slots on the shingles finally formed.
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