IMPROVED MANIFOLD ASSEMBLY FOR THERMOPLASTIC PIPE PRODUCTION

摘要

An improved manifold assembly for use with a die (15) in the extrusion of plastic comprises a water inlet tube (100); a vacuum tube (135, 140) through which a vacuum is pulled; a water return tube (125, 130); a calibration finger first section (25) having an outer surface (27), at least one water receiving channel (70) connected to the water inlet tube (100) and a vacuum channel (68, 72) connected to the vacuum tube (135, 140), and having the water return tube (130) positioned centrally of the first section outer surface (27) with the first section (25) having formed therein apertures (35, 39) connected to the vacuum channel (72); and a calibration finger second section (26) having an outer surface (86) and an interior channel (84), with the second section (26) having the water return tube (130) positioned centrally of the second section outer surface (86) and apertures (88) formed therein and connected to the interior channel (84).