Patent US3577841A successfully refreshed from Google Patents.
US3577841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruders with rotating plate
Assignee: Produits Chimiques Pechiney Saint Gobain
•
Filing: 1968-09-11
•
Granted: 1971-05-11
•
Expires: 1988-09-11
Abstract
Abstract A rotating plate extruder in which at least one of the faces of the plates is formed with grooves extending tangentially to a circle concentric with the axis of the plate to enhance use with lubricated plastic materials.
Inventors
- 👤 Claude Ledoux
- 👤 Bernard Neuville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:19
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/30; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/47; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
138 words
In an extruder formed of a pair of plates arranged to provide substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap of disc shape therebetween with a feed-opening communicating with the outer periphery of the plates and an extrusion opening axially through a central portion of one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates for shear of the material as it is displaced through the gap from the periphery to the extrusion opening in response to rotational movement of one of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in the shear area between the periphery and the extrusion opening.
Claim 2
Dependent Claim
138 words
In an extruder formed of a pair of plates arranged to provide substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap of disc shape therebetween with a feed-opening communicating with the outer periphery of the plates and an extrusion opening axially through a central portion of one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates for shear of the material as it is displaced through the gap from the periphery to the extrusion opening in response to rotational movement of one of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in the shear area between the periphery and the extrusion opening.
Claim 3
Dependent Claim
32 words
An extruder as claimed in claim 1 in which the grooves on the inner faces of the plates present a concavity turned in the opposite direction to the displacement of the material.
Claim 4
Dependent Claim
113 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in which the grooves are substantially V-shaped in cross section with the ingoing side first engaged by the material having a slope which is more gentle than the slope of the outgoing side.
Claim 5
Dependent Claim
113 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in which the grooves are substantially V-shaped in cross section with the ingoing side first engaged by the material having a slope which is more gentle than the slope of the outgoing side.
Claim 6
Dependent Claim
27 words
An extruder as claimed in claim 3 in which the angle between the ingoing side and the plane of the surface is within the range of 80-135*.
Claim 7
Dependent Claim
27 words
An extruder as claimed in claim 3 in which the angle between the ingoing side and the plane of the surface is within the range of 90-120*.
Claim 8
Dependent Claim
26 words
An extruder as claimed in claim 3 in which the angle between the outgoing side and the ingoing side of the grooves is greater than 60*.
Claim 9
Dependent Claim
24 words
An extruder as claimed in claim 1 in which the grooves are formed to a depth less than the spaced relationship between the surfaces.
Claim 10
Dependent Claim
26 words
An extruder as claimed in claim 1 in which the grooves are formed to a depth less than two-thirds of the spaced relationship between the surfaces.
Claim 11
Dependent Claim
23 words
An extruder as claimed in claim 1 in which the grooves extend tangentially outwardly from circles concentric with the axis of the plate.
Claim 12
Dependent Claim
21 words
An extruder as claimed in claim 1 in which there are at least four grooves in the surface of the plate.
Claim 13
Dependent Claim
22 words
An extruder as claimed in claim 1 in which the plate is formed with at least 12 grooves in the surface thereof.
Claim 14
Dependent Claim
99 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in which the grooves extend across the entire surface of the plate with the operative area of the plate.
Claim 15
Dependent Claim
99 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in which the grooves extend across the entire surface of the plate with the operative area of the plate.
Claim 16
Dependent Claim
26 words
An extruder as claimed in claim 1 which includes curvilinear deflection blades extending from the surface of at least one of the plates into the gap.
Claim 17
Dependent Claim
20 words
An extruder as claimed in claim 13 in which the blades are located in the central zone of the plate.
Claim 18
Dependent Claim
23 words
An extruder as claimed in claim 13 in which the portion of the plate occupied by the blades is free of the grooves.
Claim 19
Dependent Claim
106 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in which the grooved plate is formed with grooves that extend tangentially for more than one radially spaced circle concentric with the axis of the plate.
Claim 20
Dependent Claim
106 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates in which the grooved plate is formed with grooves that extend tangentially for more than one radially spaced circle concentric with the axis of the plate.
Claim 21
Dependent Claim
42 words
An extruder as claimed in claim 1 which includes a projection on the plate opposite the plate having the extrusion opening which includes an extension in axial alignment with the extrusion opening and which includes grooves in the surface of the projection.
Claim 22
Dependent Claim
27 words
An extruder as claimed in claim 17 in which the grooves in the projection have a depth greater than the grooves in the surface of the plate.
Claim 23
Dependent Claim
98 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates with grooves extending tangentially outwardly from one or more circles concentrically spaced from the axis of the plate.
Claim 24
Dependent Claim
98 words
In an extruder formed of a pair of plates arranged to provide spaced substantially parallel facing surfaces perpendicular to the axis of rotation providing a gap therebetween, an extrusion opening axially through one of the plates, means for rotating one of the plates relative to the other and means for feeding material to be extruded into the gap between the facing surfaces of the plates, the improvement comprising grooves in at least one of the facing surfaces of the plates with grooves extending tangentially outwardly from one or more circles concentrically spaced from the axis of the plate.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |