NONWOVEN LINER FOR CURED-IN-PLACE PIPES

A pipe liner comprising a nonwoven felt, and process for making said nonwoven felt, the nonwoven felt consisting essentially of 0 to 85 weight percent polyester staple fibers and 15 to 100 weight percent para-aramid staple fibers, the nonwoven felt having a basis weight of 250 to 600 grams per squar...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Rochette, France, Sahbaee, Arash
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PIPES SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A pipe liner comprising a nonwoven felt, and process for making said nonwoven felt, the nonwoven felt consisting essentially of 0 to 85 weight percent polyester staple fibers and 15 to 100 weight percent para-aramid staple fibers, the nonwoven felt having a basis weight of 250 to 600 grams per square meter and a thickness of 2.0 to 5.0 mm; wherein: 20 to 100 weight percent of the total amount of para-aramid staple fibers are re-purposed para-aramid staple fibers, 0 to 80 weight percent of the total amount of para-aramid staple fibers are crimped virgin para-aramid staple fibers having a uniform cut length, and at least 50 weight percent of the total amount of the combined polyester and para-aramid staple fibers are crimped staple fibers.