초록 ▼

A composite reinforced plastic pipe and method of making the same are disclosed wherein a resin impregnated surfacing mat is formed into a tubular inner liner on a mandrel or the like, a plurality of resin impregnated continuous fiberglass strands are helically wound upon the inner liner to form an

A composite reinforced plastic pipe and method of making the same are disclosed wherein a resin impregnated surfacing mat is formed into a tubular inner liner on a mandrel or the like, a plurality of resin impregnated continuous fiberglass strands are helically wound upon the inner liner to form an inner layer, a sand-resin composition is applied onto the inner layer to form a tubular core, and an outer layer of resin impregnated continuous fiberglass strands are helically wound upon the tubular core whereafter the composite pipe is cured to provide a pipe having high resistance to internal and external pressures.

대표청구항 ▼

A composite reinforced plastic pipe which includes a tubular inner liner of resin impregnated surfacing veil and/or mat, an inner layer of continuous resin impregnated fiberglass strands wound circumferentially in a helical manner about said inner liner in contact with the outer peripheral surface o

A composite reinforced plastic pipe which includes a tubular inner liner of resin impregnated surfacing veil and/or mat, an inner layer of continuous resin impregnated fiberglass strands wound circumferentially in a helical manner about said inner liner in contact with the outer peripheral surface of said inner liner, a core layer disposed circumferentially about said inner layer in full surface engagement therewith, said core layer consisting of a homogenous particle size sand-resin composition having a sand-resin ratio in the range of approximately 2.5:1 to 4:1 by weight, and an outer layer of continuous resin impregnated fiberglass strands wound circumferentially in a helical manner about said core layer, said inner and outer resin impregnated continuous fiberglass strands having a resin to glass ratio in the range of approximately 20:80 to 35:65 by weight, said sand-resin composition comprising a mixture of rigid resin to flexible resin in the range of approximately 80:20 to 50:50 so as to enable approximately 4-9 percent resin elongation, said inner liner, inner layer, core layer and outer layer being cured to form a composite plastic pipe having high resistance to internal and external pressures.