Pile weatherstripping having internal and external fins

Abstract

Pile weatherstripping having rows of pile and longitudinal fins both within and external to the rows of pile. The heights of the fins with respect to the height of the pile may be independently varied and controlled. A travelling endless band receives a pair of first webs providing internal fins on opposite sides of the band. The first webs are indexed to the edges of the band, which defines the heights of the fins. Each web may be independently indexed. Alignment of the webs on the band is provided either by an aligning fixture or by coining the webs to provide lines of indentations which index the webs at the edges of the band. The yarn which forms the pile is wound around the first webs. Second webs providing the external fins are indexed through the yarn and first webs to the edges of the band and are also aligned by a second aligning fixture or by coining. Backing strips are attached, as by ultrasonic welding, along the edges of the band. Then the yarn is slit without cutting into the webs. Hold-down wires may be used overlying the webs on the surfaces of the bands and below the yarn. These wires may be lifted during slitting to afford clearance of the knives from the band. After slitting there is provided a pair of weatherstrips having rows of pile provided by the slit yarn, at least one internal fin between the rows of pile, and at least one fin external to the rows of pile, the height of each fin being precisely and independently controllable with respect to the height of the pile.