Pipe extrusion die head manifold assembly

An improved manifold assembly for use with a die in the extrusion of plastic, said assembly comprising

• a water inlet tube,
• a tube through which a vacuum is pulled,
• a water return tube,
• a calibration finger first section having an outer surface, said first section having:
• 1) at least one water receiving channel connected to said water inlet tube;
• 2) a channel connected to said tube through which a vacuum is pulled;
• and 3) said water return tube positioned centrally of said first section outer surface, said first section outer surface having formed therein a spiral groove and at least two radial grooves, said spiral groove intersecting at least said two radial grooves, said first section having formed therein apertures connected to said channel connected to said tube through which a vacuum is pulled, said first section apertures located in said radial groove, said water return tube having a first component and a second component secured to each other, said first component terminating within said first section, and said second component extending beyond said first section, said second component being flexible, and
• a calibration finger second section having an outer surface and an interior channel, said second section having said water return tube positioned centrally of said second section outer surface, and said second section having formed therein apertures connected to said interior channel, said first section apertures having a first diameter and said second section apertures having a second diameter, said second diameter being greater than said first diameter.

An improved manifold assembly for use with a die in the extrusion of plastic, said assembly comprising a plurality of tubular assemblies, each of said tubular assemblies comprising

• a water inlet tube,
• a tube through which a vacuum is pulled,
• a water return tube,
• a calibration finger first section having an outer surface, said first section having:
• 1) at least one water receiving channel connected to said water inlet tube;
• 2) a channel connected to said tube through which a vacuum is pulled;
• and 3) said water return tube positioned centrally of said first section outer surface, said first section having formed therein apertures connected to said channel connected to said tube through which a vacuum is pulled, and
• a calibration finger second section having an outer surface and an interior channel, said second section having said water return tube positioned centrally of said second section outer surface, and said second section having formed therein apertures connected to said interior channel.