DUCTING

Ducting with sound absorbing properties has a helical channel 21 which opens internally of the ducting. Overlapping opposite edges of a helically wound strip 20 of polyurethane foam are crimped into the channel. An outer sleeve 3 of thermoplastic rubber is shrunk about the outside of the channel and...

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Bibliographische Detailangaben
Hauptverfasser:	FORBES, HARRY, LANDER, DAVID ROBIN, PATON, JAMES
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 INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES 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:	Ducting with sound absorbing properties has a helical channel 21 which opens internally of the ducting. Overlapping opposite edges of a helically wound strip 20 of polyurethane foam are crimped into the channel. An outer sleeve 3 of thermoplastic rubber is shrunk about the outside of the channel and projects beyond it at opposite ends to form an impermeable outer surface of the ducting and flexible cuffs 22. The outer sleeve 3 is assembled by stretching it radially outwardly by means of a vacuum applied outside the sleeve and then allowing it to shrink about the channel 21 and foam assembly placed within it.