Patent GB-1413885-A (GB)
Title: Method and apparatus for guiding feed stock to a longitudinally  moving collection surface
IPC: B29C41/08
Filed: 1973-02-05
Abstract: 1413885 Winding rib formations OWENSCORNING FIBERGLAS CORP 5 Feb 1973 [3 Feb 1972 29 Dec 1972] 5662/73 Heading B8G A plurality of reinforcing ribs 86, Fig. 1, are wound on a rotating and axially advancing cylindrical body 10 by advancing the feed stations 38 for the reinforcing material 40 in synchronism with the longitudinal advance of the cylindrical body 10. The apparatus includes a rotating squirrel cage 14 on which is wound an endless band 12. When the band 12 reaches the end of the squirrel cage it returns axially through the squirrel cage to its starting position where it is again wound on to the cage. A separation sheet 32 is wrapped on the surface formed by the band 12 followed by a glass fibre mat 34 to complete the construction of the body 10. Thereafter, resin coated strands 40 are applied to the body 10 for about one revolution of the body 10 and into the nip of the resulting winding is introduced a rib 90 having a length equal to the circumference of the body 10, the rib 90 being thus wound around the body. A resin coated mat 92, for example of glass fibre, is wound on top of the rib 90 and this is followed by several windings of resin coated strands 40. The mat 92 may be wound twice around the rib 90. The strands 40 are traversed by a helical groove 38 in a rotating cylinder 36, the rate of traverse of the strands 40 exactly matching the traverse rate of the body 10. The strands 40 receive a preliminary traverse from an endless chain 50 that moves in synchronism with the body 10. The resin coated mat 92 is carried by a tray 94 that is traversed by the cylinder 36 and the chain 50. When the winding of a reinforcing rib 86 is complete the strands 40 of the supply to the rib are cut and transferred to a continuously wound thread that is wound on at the beginning of the body 10. This permits a fresh reinforcing rib 86 to be built up, the thread supply 40 again being laid in the helical groove 38. The tray 94 will also be transferred to the beginning of the cylinder 36 and the beginning of the upper run of the chain 50. As is clear from Fig. 1, this method permits several reinforcing ribs 86 to be progressively formed at the same time. In a modified construction, Fig. 6 (not shown), an endless tape (122) again advances along and then returns through a rotating squirrel cage, the resulting cylindrical body being covered with a parting layer in the form of a band (125) that is wider than the tape (122). On the tape (122) is deposited a wall structure 130, Fig. 14, of chopped glass fibres that are disposed in a polyester, epoxy or acrylic resin. After the wall 130 has been built up to a sufficient thickness a nylon "string" is helically wrapped around the resulting cylindrical body to provide reference lines thereon. As before, a supply of rovings 181, 182, Fig. 14, traversed at the same speed as the cylindrical body so as to travel therewith, are first wrapped around the cylindrical body. The operator then inserts a reinforcing rib 156, 159 with an overlaying mat 165 of woven fiberglass, into the resulting nip. The rib 156, 159 is of a length equal to the circumference of the cylindrical body. The rovings 181, 182 and the mat 165 are sprayed with resin before application to the rib 156, 159. Several turns of the rovings 181, 182 and the mat 165 are applied to the rib 156, 159 and the apparatus is such that the rovings are divided into three bunches, a central bunch 181 and outer bunches 182. As the winding nears completion the outer bunches 182 are moved apart so as to overlap the edges of the resulting rib 196 as illustrated in Fig. 14.