초록 ▼

Device for use in rehabilitation of water supply pipes includes a tubular liner (10) which is deployed through a pipe (11) for example by a line attached to a messenger pig which is propelled through the pipe. The liner (10) has a multi-lobed pleated cross-section, and is of a polyolefin elastomer m

Device for use in rehabilitation of water supply pipes includes a tubular liner (10) which is deployed through a pipe (11) for example by a line attached to a messenger pig which is propelled through the pipe. The liner (10) has a multi-lobed pleated cross-section, and is of a polyolefin elastomer material, e,g, a substantially linear ethylene inter-polymer. The liner is extruded and die drawn during extrusion to produce a reduced diameter highly oriented structure.

대표청구항 ▼

1. A method of rehabilitating water supply pipes by inserting a tubular liner within a pipe, the method comprising the steps: positioning a collapsed pleated tube shaped liner at one end of the pipe; securing one end of the liner at the end of the pipe; subjecting the liner to movement into the

1. A method of rehabilitating water supply pipes by inserting a tubular liner within a pipe, the method comprising the steps: positioning a collapsed pleated tube shaped liner at one end of the pipe; securing one end of the liner at the end of the pipe; subjecting the liner to movement into the pipe; subjecting the liner to expansion once inserted in the pipe, the liner expanding to a star shaped multi-lobed cross section, the shape provided by longitudinally extending radial pleats and ribs; said liner made from a substantially linear ethylene inter-polymer elastomer/plastomer. 2. A method according to claim 1, wherein the liner is moved through the pipe by means of a line attached to a messenger pig propelled through the pipe by fluid pressure. 3. A method according to claim 1, wherein the liner is moved through the pipe by means of a flexible rod attached to the liner. 4. A method according to claim 1, wherein the material of the liner has a density range between 830 and 967 kg/m3. 5. A method according to claim 4, wherein said material comprises 50-95% by weight of ethylene, and 5-50% by weight of at least one olefinic co-monomer. 6. A method according to claim 5, wherein the co-monomer has from 3 to 20 carbon atoms. 7. A method according to claim 5, wherein the co-monomer is at least one of: propylene, 1-butene, 1hexene, 4-methyl-1-pentene, 1-heptene, or 1-octene. 8. A method according to claim 1, wherein the material of the liner is cross-linked.