B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/945
B29D 23/18 (2006.01)
Patent
CA 1121124
ABSTRACT OF THE DISCLOSURE The present invention provides: A mothod for continuously forming a corrugated tube from an unreinforced flat strip of synthetic resin in a softened state by the use of a plurality of rotating rollers arranged in a circular array such that said rollers define an imaginary cylinder about its central axis with the axes of said rollers being parallel to each other but angled relative to the central axis of the imaginary cylinder whereby as the rollers rotate the strip is helically wrapped around and advanced axially along said imaginary cylinder with portions of adjacent turns of the strip overlapping and jointed together to form a continuous tube, each of said rollers being provided with a plurality of axially spaced annular ridges therearound so as to form deep recesses defined by each adjacent ridge, said ridges of the respective rollers being so arranged that the associated successive ridges of each adjacent rollers are aligned in a spiral path around said imaginary cylinder, the strip being fed onto the imaginary cylinder so as to form a rigid tube having corrugations of deep grooves.
374800
Marks & Clerk
Toyo Kagaku Kabushiki Kaisha D/b/a Toyo Chemical Co. Ltd.
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