Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Cutting and uniting cut parts
Patent
1991-05-07
1993-06-08
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Cutting and uniting cut parts
174 683, 174 98, 264154, 2642091, 264248, 264255, 264256, 264261, 264262, 264263, 264266, 264275, 264278, 264279, 2642791, 264310, 285292, 285369, 285383, 285417, B29C 6500, B32B 3106, F16L 4700, H02G 304
Patent
active
052176673
ABSTRACT:
A concrete conduit is completely encased within a shell of a plastic resin such as polyethylene. The plastic shell functions to insulate the concrete conduit from mechanical shocks thereby preventing breakage and cracking of the conduit. The shell also effectively provides an impermeable barrier for water vapor and a smooth, relatively frictionless, surface for receiving electric cables, wires and the like. The conduit is made by preforming the shell, for example by rotational molding, and filling the shell with pourable cement through a filler hole in the shell. The filler hole can then be closed with a plug of the resin used to form the shell.
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Aftergut Karen
Progressive Polymerics Inc.
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