Abstract Method and apparatus for producing laminated hollow structures having at least one glass fiber reinforced resinous layer wherein there are simultaneously applied to a winding core or rotationally symmetrical form (a) a filamentary fleece or web of a fibrous organic polymer such as continuous polyester filaments, and (b) a winding layer of glass fiber roving or rovings impregnated with a curable thermosetting synthetic resin such as unsaturated polyester resins or epoxy resins. The apparatus includes, in addition to means for wrapping the roving or rovings of glass fibers, a blowing nozzle means for the continuous deposition of the fibrous fleece or web at a displaced angle with reference to the winding application of the glass fiber roving material. The products of the invention are useful as storage vessels, pipes, tubes, cylinders, fittings and the like, e.g. as frequently required in the petrochemical industry.
A method as claimed in claim 1 wherein layer (a) is composed of continuous polyethylene terephthalate filaments and layer (b) is composed of continuous fiberglass filaments.
Claim 2
Dependent Claim
24 words
A method as claimed in claim 1 wherein said thermosetting resin is selected from the class consisting of unsaturated polyester resins and epoxy resins.
Claim 3
Dependent Claim
39 words
A method as claimed in claim 1 wherein the air-laid fleece of layer (a) is deposited on a fresh resin surface of the winding core in a band width slightly greater than the fiberglass roving band of layer (b).
Claim 4
Dependent Claim
35 words
A method as claimed in claim 1 wherein layer (a) is applied as at least one of the inner and outer surfaces of said hollow structure and is composed of water-resistant linear polyester continuous filaments.
Claim 5
Dependent Claim
40 words
A method as claimed in claim 1 wherein at least one additional fleece layer composed of continuous fiberglass filaments is applied by air-laying the fiberglass filaments in the same manner as layer (a) but only between two roving layers (b).
Claim 6
Dependent Claim
41 words
A method as claimed in claim 1 wherein said continuous polyester filaments are supplied in untwisted form to a blowing nozzle for resolution into individual filaments and their continuous random deposition onto the rotating core to form the fleece layer (a).
Claim 7
Dependent Claim
29 words
A method as claimed in claim 1 wherein said liquid thermosetting resin is applied in a preliminary step followed by simultaneous application of layer (a) covered by layer (b).