US3873072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt extrusion
Assignee: Monsanto Co
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Filing: 1973-01-24
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Granted: 1975-03-25
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Expires: 1993-01-24
Abstract
Abstract In a screw mixer, interrupted feed-compression flights radially extending from the root of the screw along helical lines intermesh with interrupted feed-restraining flights radially extending from the barrel along reverse complementing helical lines with respect to the disposition of the feed-compression flights. As the screw is rotated, intensive shearing of the material being axially forwarded is accomplished in alternation with periods of substantially lower or no shearing. The apparatus is quite suitable for mixing and kneading a wax-like substance into a moving stream of molten synthetic fiber-forming polymer just prior to forming filaments therefrom.
Inventors
- 👤 Lawrence E Blackmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:56
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06; D01D1/065; B; B01; B01F; B01F27/00; B01F27/60; B01F27/70; B01F27/707; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/402; B29B7/42; B29B7/44; B29B7/74; B29B7/7461; B29B7/80; B29B7/82; B29B7/88; B29B7/94; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/68; B29C48/685; B29C48/687; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
Apparatus for mixing and kneading a wax-like substance into a moving stream of molten synthetic fiber-forming polymer comprising: a. a heated barrel having an entrance and an exit; b. a screw operatively positioned for driven non-oscillating rotation within said barrel for propelling the wax-like substance and polymer from the entrance to the exit and uniformly dispersing the wax-like substance as a separate and distinct phase in the polymer as the same moves therethrough; c. a series of fixed feed-compression flights radially outwardly extending from the root of the screw along helical lines, each flight of which is interrupted to provide a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; d. a series of fixed feed-resisting flights extending radially inwardly from the barrel along reverse complementing helical lines with respect to the disposition of the feed-compression flights, each feed-resisting flight being composed of a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; said screw blades and barrel blades being spaced on the screw and barrel, respectively, such that during rotation of the screw the distance of closest approach of the leading edge of the screw blades and the trailing edge of the barrel blades is between about one-eighth inch and about one thirty-second inch.
Claim 2
Dependent Claim
217 words
Apparatus for mixing and kneading a wax-like substance into a moving stream of molten synthetic fiber-forming polymer comprising: a. a heated barrel having an entrance and an exit; b. a screw operatively positioned for driven non-oscillating rotation within said barrel for propelling the wax-like substance and polymer from the entrance to the exit and uniformly dispersing the wax-like substance as a separate and distinct phase in the polymer as the same moves therethrough; c. a series of fixed feed-compression flights radially outwardly extending from the root of the screw along helical lines, each flight of which is interrupted to provide a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; d. a series of fixed feed-resisting flights extending radially inwardly from the barrel along reverse complementing helical lines with respect to the disposition of the feed-compression flights, each feed-resisting flight being composed of a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; said screw blades and barrel blades being spaced on the screw and barrel, respectively, such that during rotation of the screw the distance of closest approach of the leading edge of the screw blades and the trailing edge of the barrel blades is between about one-eighth inch and about one thirty-second inch.
Claim 3
Dependent Claim
222 words
Apparatus for mixing and kneading a wax-like substance into a moving stream of molten synthetic fiber-forming polymer comprising: a. a heated barrel having an entrance and an exit; b. a single full-flighted screw of constant channel depth operatively positioned for driven non-oscillating rotation within said barrel for propelling the wax-like substance and polymer from the entrance to the exit and uniformly dispersing the wax-like substance as a separate and distinct phase in the polymer as the same moves therethrough; c. a series of feed-compression flights radially outwardly extending from the root of the screw along helical lines, each flights of which is interrupted to provide a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; d. a series of fixed feed-resisting flights extending radially inwardly from the barrel along reverse complementing helical lines with respect to the disposition of the feed-compression flights, each feed-resisting flight being composed of a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; said screw blades and barrel blades being spaced on the screw and barrel, respectively, such that during rotation of the screw the distance of closest approach of the leading edge of the screw blades and the trailing edge of the barrel blades is between about one-eighth inch and about one thirty-second inch.
Claim 4
Dependent Claim
222 words
Apparatus for mixing and kneading a wax-like substance into a moving stream of molten synthetic fiber-forming polymer comprising: a. a heated barrel having an entrance and an exit; b. a single full-flighted screw of constant channel depth operatively positioned for driven non-oscillating rotation within said barrel for propelling the wax-like substance and polymer from the entrance to the exit and uniformly dispersing the wax-like substance as a separate and distinct phase in the polymer as the same moves therethrough; c. a series of feed-compression flights radially outwardly extending from the root of the screw along helical lines, each flights of which is interrupted to provide a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; d. a series of fixed feed-resisting flights extending radially inwardly from the barrel along reverse complementing helical lines with respect to the disposition of the feed-compression flights, each feed-resisting flight being composed of a plurality of circumferentially spaced spoke-like blades each having a leading edge and a trailing edge; said screw blades and barrel blades being spaced on the screw and barrel, respectively, such that during rotation of the screw the distance of closest approach of the leading edge of the screw blades and the trailing edge of the barrel blades is between about one-eighth inch and about one thirty-second inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |