Method and apparatus for forming a thick-walled tubular product

Details Method and apparatus for forming a thick-walled tubular product Method and apparatus for forming a thick-walled tubular product

1972-10-30

1976-09-14

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264237, 425378R, B29F 308, B29D 2304

Patent

active

039807460

ABSTRACT:
A mandrel and bushing sizing die assembly has an annulus formed between the mandrel and the bushing of the assembly for passing plastic material therethrough and forming a thick-walled tubular product. A middle portion of the annulus has a thickness in the range of about 25-50 percent of the greatest thickness of a first end portion of the annulus and the second, discharge end of the annulus has a thickness greater than about 1/4-inch and greater than the thickness of the middle portion of the annulus.

REFERENCES:
patent: 2400055 (1946-05-01), Wallace
patent: 3239881 (1966-03-01), Larsen
patent: 3309436 (1967-03-01), Larsen

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