Production of PVC irrigation pipe and the pipe so produced

Details Production of PVC irrigation pipe and the pipe so produced Production of PVC irrigation pipe and the pipe so produced

1982-10-04

1986-03-25

Anderson, Philip

Hydraulic and earth engineering

Drainage or irrigation

Porous or apertured pipe, flume, or tileway

264 54, 2642095, 264211, 264321, 264DIG8, 264DIG13, 405 36, 405 43, 425325, 425817C, A01G 2502, B29C 6722, B29C 5522

Patent

active

045779988

ABSTRACT:
Process for producing flexible PVC irrigation pipe by extruding a plasticized PVC composition containing a melt strength-enhancing aid and a chemical blowing agent and (a) the extruded melt being expanded by foaming thereof immediately on leaving the die into a substantially closed-cell extrudate of outer diameter greater than the die orifice with the extrudate surfaces being substantially unpunctured, (b) drawing down the extrudate in the atmosphere causing rupturing of the foam cell walls of the extrudate to form a substantially open-cell extrudate having punctured surfaces, and (c) when the extrudate has been drawn down to a degree which is prior to any cellular collapse which would lead to the formation of water-impervious pipe, cooling the extrudate by passing it through a cooling means in order to prevent said collapse. Preferably the extrudate passes through a tubular guide into a water bath in step (c). The pipe thus produced is suitable for irrigation applications and may be used for long periods without exhibiting an unacceptable decrease in water-permeability.

REFERENCES:
patent: 2807505 (1957-09-01), Weitzel
patent: 3300366 (1967-01-01), Krolik, Jr.
patent: 3403203 (1968-09-01), Schirmer
patent: 3539666 (1970-11-01), Schirmer
patent: 3634564 (1972-01-01), Okamoto et al.
patent: 3874965 (1975-04-01), Greenwald et al.
patent: 3954928 (1976-05-01), Omori et al.

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