B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
B28B 7/00 (2006.01) B05D 1/02 (2006.01) B05D 3/02 (2006.01) B05D 5/00 (2006.01) B28B 7/36 (2006.01) B31C 11/04 (2006.01) E04G 13/02 (2006.01) F16L 9/16 (2006.01)
Patent
CA 2132478
A concrete column forming tube and method of making same for receiving poured concrete column therein to produce a concrete column is characterized by a smooth inside coated surface in the forming tube to eliminate spiral seam lines and other undesirable characteristics on the outside surface of the formed concrete column. The tube is formed from spirally-wound plies of paper adhered together and has a centrifugally-cast epoxy resin coating sprayed onto the inside surface of the spirally-wound tube while the tube is rotating to produce a smooth inside coated surface on the forming tube.
Bacon Robert D. Jr.
Bonds Honor S.
Floyd Arnold B. Jr.
Johnson Troy W. Jr.
Martin James R.
Sim & Mcburney
Sonoco Products Company
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