Plastic article or earthenware shaping or treating: apparatus – Means providing a shaping orifice – Core – pin or insert member
Patent
1981-08-20
1983-07-26
Thurlow, Jeffery R.
Plastic article or earthenware shaping or treating: apparatus
Means providing a shaping orifice
Core, pin or insert member
264514, 264173, 2642098, 4251311, 4253261, 425380, 425462, B29F 304
Patent
active
043952216
ABSTRACT:
An apparatus is provided to ensure uniform distribution of molten thermoplastic resin around a tubular die annulus upon extrusion of a thermoplastic tube. The apparatus comprises a first toroidal or partly toroidal (C-shaped) chamber surrounding the die into which the molten resin is fed from one side, and a plurality of openings through which the molten plastic flows from the first chamber into a second toroidal chamber, which feeds the die annulus. The cross-sectional area of each of the openings is gradually increased from a point adjacent the entry of the molten resin to a maximum feed opening cross-section at a point farthest removed from the resin entry point. This arrangement ensures a more uniform molten resin distribution around the die annulus during extrusion. To improve uniformity of resin distribution through the die for different resins having different flow characteristics, the openings are arranged to have as large a length as possible, preferably by being oriented axially of the die, and the length may progressively decrease from one opening to another beginning at a resin inlet. Resin stagnation is minimized by progressively decreasing the cross sectional area of the first chamber from a point closest to a resin inlet to a point farthest removed from the inlet.
REFERENCES:
patent: 2239408 (1941-04-01), Wallace
patent: 2766479 (1956-10-01), Henning
patent: 2864126 (1958-12-01), Henning
patent: 2911676 (1959-11-01), Henning
patent: 2978748 (1961-04-01), McCauley et al.
patent: 3221372 (1965-12-01), Lieberman
patent: 3321803 (1967-05-01), Corbett
patent: 3608136 (1971-09-01), Tripptrap
patent: 3859017 (1975-01-01), Meudec
patent: 4171195 (1979-10-01), Klein et al.
patent: 4285656 (1981-08-01), Herrington
Gilman M. G.
Huggett C. A.
Mobil Oil Corporation
Powers, Jr. J. F.
Thurlow Jeffery R.
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