Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1994-04-07
1996-04-09
Ball, Michael W.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
156195, 26417717, 264558, 264560, 4253781, 425380, B29C 4790, B29C 5358
Patent
active
055058973
ABSTRACT:
A method for manufacturing plastic pipe such that the pipe has apertures formed therein when the pipe is viewed in cross-section, comprising the steps of having hot plastic flow through a die and subsequently be extruded through a die head to form an extruded wall component having first and second end wails, with the die head having formed therein a plurality of first sized gaps and a plurality of second sized gaps, with the second sized gaps having an aperture located inside each of said second sized gaps. The die is secured to a manifold assembly, with the manifold assembly comprising sets of tubes located centrally of one another, each set of tubes comprising a water inlet tube, a tube through which a vacuum is pulled, and a water return tube. Each set of tubes is positioned longitudinally within a respective die manifold tube with the outermost surface of each set of tubes spaced a first distance from the respective die manifold tube. Each of the respective die manifold tubes extends through the die.
REFERENCES:
patent: 2451986 (1948-10-01), Slaughter
patent: 3274315 (1966-09-01), Kawamura
patent: 3907961 (1975-09-01), Carrow
patent: 3917500 (1975-11-01), Petzetakis et al.
patent: 4510004 (1985-04-01), Hawerkamp
patent: 5261988 (1993-11-01), Dikis et al.
Martin Larry L.
Wise John
Advanced Drainage Systems, Inc.
Ball Michael W.
Reed David W.
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