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(11)    Patent No :    AP 1903    (73) Applicant(s)       
(21)    Application No :    AP/P/2004/003175    SEKISUI RIB LOC AUSTRALIA PTY LTD, 587 Grand       
            Junction       
                   
(22)    Filing Date :    17.04.2003    Australia       
(24)    Date of Grant &    16.10.2008           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    BATEMAN Ian Roger, Australia   
    AU    PS 1824    22.04.2002    UYSAL Gulcay, Australia   
                   
                (74) Representative   
(84)    Designated State           
                   
    GM  GH   KE    LS   MW  MZ    SL   SD   SZ    FISHER CORMACK & BOTHA   
    T Z   UG   ZM   ZW               
                   
(51)    International    Classification    B29C 53/58 (2007.01)    B29C 53/78 (2007.01)   
            F16L 9/16 (2007.01)    F16L 55/165 (2007.01)   

(54)    Title

Composite strip windable to form a helical pipe and  method therefor

(57)    Abstract

A composite strip (10) windable to form a helical pipe is disclosed. The composite strip (10) comprises: an elongate plastic strip (11) having a base portion (12) and at least one lengthwise extending rib portion (20) upstanding

from the base portion (12); and an elongate reinforcing strip (30) extending lengthwise and supported laterally by the rib portion (20), the reinforcing

strip

(30) having a height to thickness ratio of at least three to one and orientated substantially perpendicular to the base portion (12). When wound into a helical pipe, the reinforcing strip (30) reinforces the pipe against radial crushing loads. A bead (40) seals the reinforcing strip (30) from the environment. Desirably the composite strip (10) further comprises: a planar lamina (50) extending lengthwise and bonded to the base portion (12), the lamina (50) having a higher Young's modulus and strength than those of the

(56)    Documents Cited :    US 4 869 295 A    NO 93 07412 A    EP 0 535 326 A    JP 64 087992 A

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