US3596320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for melting and dispersion of thermoplastic polymers
Assignee: Honeywell International Inc
•
Filing: 1968-11-15
•
Granted: 1971-08-03
•
Expires: 1988-11-15
Abstract
Abstract An improved apparatus for uniformly mixing polymer materials and additives wherein one constituent may be a low viscosity component and the other a viscous polymer mixed by passage through an extruder having the overall length comprised of a feed zone 10-20 percent; a transition zone 27-40 percent and a metering zone of 45-60 percent. Within said metering zone there are two to six flight interruptions, said method of mixing polymers producing an extrudate with a coefficient of particle variation of less than 30 percent and said polyblends and low viscosity materials incorporated in polymers being both suitable for piece dyeing when converted into textile articles.
Inventors
- 👤 Donald P Manning
- 👤 Lloyd D Caison
- 👤 Frank R Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:53
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/78; B29C48/80; B29C48/84; B29C48/85; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/422; B29B7/428; B29B7/429; B29C48/50; B29C48/505; B29C48/565; B29C48/67; B29C48/83; B29C48/832; B29C48/845; B29B7/80; B29B7/82; B29B7/826; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The apparatus of claim 1 in which the flight interruptions have a lead distance to extruder diameter ratio of 0.65 to 1.1 .
Claim 2
Dependent Claim
35 words
The apparatus of claim 1 in which a portion of the screw within the transition zone is provided with a low angle ramp deviating by 1* to 2* from the normal taper of said screw.
Claim 3
Dependent Claim
18 words
The apparatus of claim 3 in which the flight screw is provided with at least two mixing rings.
Claim 4
Dependent Claim
77 words
The apparatus of claim 2 in which the first screw flight is separated from a seal wall of the extruder adjacent the inlet thereof a portion of the screw within the transition zone is provided with a low angle ramp deviating by 1* to 2* from the normal taper of said screw the flight screw is provided with at least two mixing rings, and the feed zone is less than one-half the length of the transition zone.
Claim 5
Dependent Claim
279 words
Apparatus for extruding a flowable mixture of polymeric materials comprising: a. an extrusion cylinder having a longitudinally cylindrical bore formed therein and provided with inlet means and outlet means; and b. a screw rotatably mounted within the bore having a helical screw flight thereon, said screw flight having maximum depth at said inlet and gradually diminishing along the screw to an intermediate point whereby the extrusion cylinder is comprised of a feed zone, a transition zone, and a metering zone, said metering zone comprising from 45 to 60 percent of the length of said extrusion cylinder, and the helical screw flight within the metering zone provided with two to six flight interruptions, and the ratio of the flight interruption length to the extrusion cylinder diameter being between 0.1 and 0.36 , flights in the transition section have a lead distance to extruder diameter ratio of 0.65 to 1.1 , the first screw flight is separated from the seal wall of the extruder adjacent the inlet thereof, the screw within the transition zone is provided with a low angle ramp deviating by 1*to 2*from the normal taper of said screw, the screw in the metering zone is provided with at least two mixing rings, the tip radius of the flight edge at the interruptions is 0.5 to 1.5 inches, and the flight edge in the transition zone facing the feed section has a radius of curvature divided by the extruder diameter ratio of between 0.07 and 0.14 , while in the transition zone the side of the flight edge toward the metering zone has a radius of curvature divided by the extruder diameter ratio of between 0.035 and 0.089 .
References Cited (Backward Citations)
US2813302A
Cited
US3070836A
Cited
US3146493A
Cited
US3235640A
Cited
US3068514A
Cited
US3121914A
Cited
US3248469A
Cited
US3344215A
Cited
US3295160A
Cited
US3440309A
Cited
US3484507A
Cited
US3482006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |