Patent US3687423A successfully refreshed from Google Patents.
US3687423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously operating screw machine for the treatment of plastic masses
Assignee: Werner and Pfleiderer GmbH
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Filing: 1969-12-19
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Granted: 1972-08-29
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Expires: 1989-12-19
Abstract
Abstract A continuously operating, preferably single screw shaft, multiple-thread screw machine for the treatment, such as, for example, kneading, mixing and homogenizing, of plastic masses with a housing surrounding the screw shaft. The kneading, mixing and homogenizing treatment is carried out by the repeated and controlled separation and recombination of the stream of material. The separation and recombination is accomplished by a screw provided with cross webs in the individual screw channels and longitudinal webs on the outer periphery of the screw threads. The outer edges of the longitudinal webs are spaced from the inner wall of the housing at a greater distance than the clearance of the screw threads with respect to the inner wall of the housing. In addition, the longitudinal webs and cross webs have a flat rising slope of about between 15* to 30* in the direction of rotation of the screw.
Inventors
- 👤 Heinz Koch
- 👤 Eugen Martin Vohringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:04
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/428; B29B7/429; B29C; B29C48/00; B29C48/03; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/59; B29C48/60
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
120 words
Continuously operating screw machine for the treatment, such as kneading, mixing and homogenizing, of plastic masses, comprising: a housing; at least one screw shaft means operatively associated with and surrounded by said housing; said screw shaft means having multiple threads defining screw channels therebetween; cross webs located in said screw channels; and longitudinal webs located adjacent the outer periphery of said threads of said screw shaft means, said cross webs and said longitudinal webs having a larger clearance with respect to internal walls of said housing than the outer periphery of the threads of said screw shaft means, wherein each of said screw channels, respectively one of said cross webs and one of said longitudinal webs constitute a stream-dividing node.
Claim 2
Dependent Claim
120 words
Continuously operating screw machine for the treatment, such as kneading, mixing and homogenizing, of plastic masses, comprising: a housing; at least one screw shaft means operatively associated with and surrounded by said housing; said screw shaft means having multiple threads defining screw channels therebetween; cross webs located in said screw channels; and longitudinal webs located adjacent the outer periphery of said threads of said screw shaft means, said cross webs and said longitudinal webs having a larger clearance with respect to internal walls of said housing than the outer periphery of the threads of said screw shaft means, wherein each of said screw channels, respectively one of said cross webs and one of said longitudinal webs constitute a stream-dividing node.
Claim 3
Dependent Claim
46 words
Screw machine according to claim 1, wherein said longitudinal webs are formed by sections of respective screw threads having the outermost portions cut away so that the outermost edges of these sections have a larger spacing from the housing than the remaining portions of the threads.
Claim 4
Dependent Claim
32 words
Screw machine according to claim 1, wherein respectively one of said cross webs and one of said longitudinal webs form an angle therebetween and have a common vertex constituting the stream-dividing node.
Claim 5
Dependent Claim
44 words
Screw machine according to claim 1, wherein the outer edges of said longitudinal webs are spaced from the inner wall of said housing and the spacing therebetween being larger than the clearance of said threads with respect to the inner wall of said housing.
Claim 6
Dependent Claim
44 words
Screw machine according to claim 3, wherein the outer edges of said longitudinal webs are spaced from the inner wall of said housing and the spacing therebetween being larger than the clearance of said threads with respect to the inner wall of said housing.
Claim 7
Dependent Claim
30 words
Screw machine according to claim 2, wherein the stream-dividing nodes of adjacent screw channels are offset with respect to each other in the conveying direction of said screw shaft means.
Claim 8
Dependent Claim
53 words
Screw machine according to claim 6, wherein an end portion of a cross web of one stream-dividing node is operatively connected, by means of a continuous thread portion, to a beginning portion of a longitudinal web of the stream-dividing node offset with respect thereto in the conveying direction in the adjacent screw channel.
Claim 9
Dependent Claim
30 words
Screw machine accorDing to claim 7, wherein each of said one respective cross web and longitudinal web constitutes the stream-dividing node by forming an angle therebetween with a common vertex.
Claim 10
Dependent Claim
27 words
Screw machine according to claim 7, wherein at least one cross web is located in the zone of said continuous thread portion connecting the offset stream-dividing nodes.
Claim 11
Dependent Claim
30 words
Screw machine according to claim 9, wherein each of said one respective cross web and longitudinal web constitutes the stream-dividing node by forming an angle therebetween with a common vertex.
Claim 12
Dependent Claim
23 words
Screw machine according to claim 6, wherein at least one cross web is located between two stream-dividing nodes in the same screw channel.
Claim 13
Dependent Claim
53 words
Screw machine according to claim 11, wherein an end portion of a cross web of one stream-dividing node is operatively connected, by means of a continuous thread portion, to a beginning portion of a longitudinal web of the stream-dividing node offset with respect thereto in the conveying direction in the adjacent screw channel.
Claim 14
Dependent Claim
30 words
Screw machine according to claim 12, wherein each of said one respective cross web and longitudinal web constitutes the stream-dividing node by forming an angle therebetween with a common vertex.
Claim 15
Dependent Claim
48 words
Screw machine according to claim 7, wherein n number of threads are provided at said screw shaft means, and n-1 additional cross webs are provided in the zone of said continuous thread portion connecting two stream-dividing nodes offset in the conveying direction and related to adjacent screw channels.
Claim 16
Dependent Claim
72 words
Screw machine according to claim 14, wherein a feed zone and a transition zone are provided at said screw shaft means, the stream-dividing nodes connected by said continuous thread portion being arranged in n-1 sequences, and k-1 additional cross webs being provided at the transition between said feed and transition zones in front of each first stream-dividing node of a kth thread, wherein 1 < or = k < or = n.
Claim 17
Dependent Claim
23 words
Screw machine according to claim 15, wherein at least one cross web is located between two stream-dividing nodes in the same screw channel.
Claim 18
Dependent Claim
31 words
Screw machine according to claim 7, wherein an even number n of threads are provided and the stream-dividing nodes are arranged in parallel groups respectively arranged on a common cross-sectional plane.
Claim 19
Dependent Claim
72 words
Screw machine according to claim 17, wherein an odd number z of additional cross webs are provided between two stream-dividing nodes located in the same screw channel, and wherein (z + 1/2) of the additional cross webs are in the zone of said continuous thread portion and the remaining (z - 1/2) additional cross webs are located after the stream-dividing node following said continuous thread portion, as seen in the conveying direction.
Claim 20
Dependent Claim
30 words
Screw machine according to claim 15, wherein each of said one respective cross web and longitudinal web constitutes by stream-dividing node by forming an angle therebetween with a common vertex.
Claim 21
Dependent Claim
27 words
Screw machine according to claim 19, wherein at least one cross web is located in the zone of said continuous thread portion connecting the offset stream-dividing nodes.
Claim 22
Dependent Claim
23 words
Screw machine according to claim 19, wherein at least one cross web is located between two stream-dividing nodes in the same screw channel.
Claim 23
Dependent Claim
53 words
Screw machine according to claim 17, wherein a shearing zone and a feeding zone located forwardly of said shearing zone are provided at said screw shaft means and (n/2) threads are provided at said feeding zone, and wherein two threads of said shearing zone are associated with one thread of said feeding zone.
Claim 24
Dependent Claim
48 words
Screw machine according to claim 22, wherein (z - 1/2) additional cross webs are provided in the channel of the stream-dividing nodes of a second of said parallel groups of the nodes located in a cross-sectional plane axially between the first and the second of said parallel groups.
Claim 25
Dependent Claim
30 words
Screw machine aCcording to claim 23, wherein each of said one respective cross web and longitudinal web constitutes the stream-dividing node by forming an angle therebetween with a common vertex.
Claim 26
Dependent Claim
72 words
Screw machine according to claim 24, wherein an odd number z of additional cross webs are provided between two stream-dividing nodes located in the same screw channel, and wherein (z + 1/2) of the additional cross webs are in the zone of said continuous thread portion and the remaining (z - 1/2) additional cross webs are located after the stream-dividing node following said continuous thread portion, as seen in the conveying direction.
Claim 27
Dependent Claim
27 words
Screw machine according to claim 25, wherein at least one cross web is located in the zone of said continuous thread portion connecting the offset stream-dividing nodes.
Claim 28
Dependent Claim
23 words
Screw machine according to claim 25, wherein at least one cross web is located between two stream-dividing nodes in the same screw channel.
Claim 29
Dependent Claim
16 words
Screw machine according to claim 1, wherein said threads have bent portions at the stream-dividing nodes.
Claim 30
Dependent Claim
44 words
Screw machine according to claim 28, wherein the outer edges of said longitudinal webs are spaced from the inner wall of said housing and the spacing therebetween being larger than the clearance of said threads with respect to the inner wall of said housing.
Claim 31
Dependent Claim
30 words
Screw machine according to claim 29, wherein each of said one respective cross web and longitudinal web constitutes the stream-dividing node by forming an angle therebetween with a common vertex.
Claim 32
Dependent Claim
30 words
Screw machine according to claim 30, wherein the stream-dividing nodes of adjacent screw channels are offset with respect to each other in the conveying direction of said screw shaft means.
Claim 33
Dependent Claim
53 words
Screw machine according to claim 31, wherein an end portion of a cross web of one stream-dividing node is operatively connected, by means of a continuous thread portion, to a beginning portion of a longitudinal web of the stream-dividing node offset with respect thereto in the conveying direction in the adjacent screw channel.
Claim 34
Dependent Claim
27 words
Screw machine according to claim 32, wherein at least one cross web is located in the zone of said continuous thread portion connecting the offset stream-dividing nodes.
Claim 35
Dependent Claim
23 words
Screw machine according to claim 31, wherein at least one cross web is located between two stream-dividing nodes in the same screw channel.
Claim 36
Dependent Claim
31 words
Screw machine according to claim 31, wherein an even number n of threads is provided and the stream-dividing nodes are arranged in parallel groups respectively arranged on a common cross-sectional plane.
Claim 37
Dependent Claim
28 words
Screw machine according to claim 1, wherein said longitudinal webs and said cross webs are provided with a substantially flat ascending slope of between about 15* to 30*.
Claim 38
Dependent Claim
44 words
Screw machine according to claim 36, wherein the outer edges of said longitudinal webs are spaced from the inner wall of said housing and the spacing therebetween being larger than the clearance of said threads with respect to the inner wall of said housing.
Claim 39
Dependent Claim
33 words
Screw machine according to claim 37, wherein respectively one of said cross webs and one of said longitudinal webs form an angle therebetween and have a common vertex thereby constituting the stream-dividing node.
Claim 40
Dependent Claim
30 words
Screw machine according to claim 38, wherein the stream-dividing nodes of adjacent screw channels are offset with respect to each other in the conveying direction of said screw shaft means.
Claim 41
Dependent Claim
53 words
Screw machine according to claim 39, wherein an end portion of a cross web of one stream-dividing node is operatively connected, by means of a continuous thread portion, to a beginning portion of a longitudinal web of the stream-dividing node offset with respect thereto in the conveying direction in the adjacent screw channel.
Claim 42
Dependent Claim
27 words
Screw machine according to claim 40, wherein at least one cross web is located in the zone of said continuous thread portion connecting the offset stream-dividing nodes.
Claim 43
Dependent Claim
23 words
Screw maChine according to claim 38, wherein at least one cross web is located between two stream-dividing nodes in the same screw channel.
Claim 44
Dependent Claim
48 words
Screw machine according to claim 39, wherein n number of threads are provided at said screw shaft means, and n-1 additional cross webs are provided in the zone of said continuous thread portion connecting two stream-dividing nodes offset in the conveying direction and related to adjacent screw channels.
Claim 45
Dependent Claim
16 words
Screw machine according to claim 37, wherein said threads have bent portions at the stream-dividing nodes.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |