H - Electricity – 02 – G
Patent
H - Electricity
02
G
H02G 15/18 (2006.01) B29C 53/58 (2006.01) B29C 53/74 (2006.01) B29C 53/82 (2006.01) B29C 61/06 (2006.01) B29C 63/42 (2006.01) B29C 69/00 (2006.01) F16B 4/00 (2006.01)
Patent
CA 2059007
A removable core for a shrinkable tubular sheath is disclosed comprising a tubular wall formed from a plurality of helically wrapped, overlapping, laminated layers of a continuous web and a helical weakened line in said wall. Also disclosed is a method for producing such a removable core comprising the steps of extruding an advancing web of heated plastic material; taking up said advancing web on a plurality of helically skewed forming rollers disposed within a cylindrical envelope; helically wrapping said advancing web around said forming rollers into a tube having a wall formed of a plurality of overlapping layers of said web while advancing said tube along said forming rollers; forming a lamination bond between the layers of the web; forming a weakened helical groove in said wall; cooling said tube; and cutting said tube into desired lengths. Further disclosed is an apparatus for producing such a removable core comprising means for extruding a plastic web, a plurality of helically skewed, co- rotating forming rollers around which the web is helically coiled into overlapping layers, a pressure roller for enhancing the binding of the layers and maintaining tension, and a cutter for forming a continuous helical groove in the core wall. In alternate embodiments, the helical weakened line is formed by the extrusion die as a continuous, longitudinal notch in the web, or by a notching tool.
Atcoflex Inc.
Ridout & Maybee Llp
LandOfFree
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