GB1359672A - Extruder screw - Google Patents
Extruder screwInfo
- Publication number
- GB1359672A GB1359672A GB1765471A GB1765471A GB1359672A GB 1359672 A GB1359672 A GB 1359672A GB 1765471 A GB1765471 A GB 1765471A GB 1765471 A GB1765471 A GB 1765471A GB 1359672 A GB1359672 A GB 1359672A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- channel
- downstream
- thread
- upstream
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/62—Screws characterised by the shape of the thread channel, e.g. U-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
1359672 Extrusion screw PLAST-UND ELASTVERARBEITUNGSMASCHINENKOMBINAT KARL-MARX-STADT 27 May 1971 17654/71 Heading B5A [Also in Division B1] The volume of an extruder screw channel 3, Fig. 1, in a melting zone downstream of the extruder inlet port 2 is progressively decreased by a channel portion 5 of increased diameter into which the melt separates, and which commences on the downstream and/or upstream side of the screw web 4 and is respectively of greater or lesser pitch than the screw web 4 to effect the increasing compression. The screw provides communication with the molten material, of the pressure developed by the unmelted material upstream thereof. The screw core may be cylindrical or slightly conically tapering, and the step 9 between the channel portion 5 of larger, and the portion 7 of smaller diameter, may at right angles or oblique to the screw core. The configuration of the Fig. 1, screw may be effected in a two start thread. An increased diameter portion 5 adjacent the downstream thread side, as in Fig. 1, is preferable for polyethylene or polyamide materials which adhere to the screw, and an increased diameter portion on the upstream thread side is preferable for non-adhering material such as rigid P.V.C. The screw of the Fig. 1 embodiment may be provided with an axial passage extending upstream from the melting zone and serving to remove volatiles via radial bores connecting to the melting zone channel portion 7 of smaller diameter. The extruder may employ a pair of contra-rotating and non-intermeshing screws of the Fig. 1 configuration. In a modification of the Fig. 1 screw, Fig. 3 (not shown), a further similar channel portion of greater diameter than the portion 5 is provided adjacent the downstream side of the screw thread 4 and commencing and terminating downstream of the commencement and termination of the portion 5, and the three channel portions of differing depth provide for materials having a viscoelastic state, intermediate solid, and a molten state. In a further modification of the Fig. 1 embodiment, the portion 5 may terminate at a tapering section of the channel base into a metering channel of increased depth. In the Fig. 5 embodiment, channel portions 5 of increased diameter are provided on both the upstream and downstream side of the thread 4, and both terminate in a channel of the same depth which thereafter is of progressively decreasing compression effected by grooves 13 and 14 respectively adjacent the downstream and upstream side of the thread 4 and which are respectively of greater and lesser pitch than web 4. A mixing screw, e.g. for mixing of soluble or insoluble dyestuffs and pigment, is shown in Figs. 9 and 11, in which both a channel portion 5 of increased diameter and a portion 10 of further increased diameter are provided on the downstream thread side. Semi-circular grooves 18, 19, are provided respectively between the portions 5, 10 and between the portion 5 and the thread 4, and the portions 5, 10 are provided with recesses 17 which, on the portion 10, may be provided to the tip of the screw. A flow pattern along the recess 17 is provided superimposed on the flow tangentially to the portions 5, 10 caused by rotation of the screw, and the mixing effect of these flows is enhanced by the mixing thereof in the grooves 18, 19.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7116825A FR2093483A5 (en) | 1970-05-08 | 1971-05-10 | |
GB1765471A GB1359672A (en) | 1970-05-08 | 1971-05-27 | Extruder screw |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD14738870 | 1970-05-08 | ||
GB1765471A GB1359672A (en) | 1970-05-08 | 1971-05-27 | Extruder screw |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1359672A true GB1359672A (en) | 1974-07-10 |
Family
ID=25747322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1765471A Expired GB1359672A (en) | 1970-05-08 | 1971-05-27 | Extruder screw |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2093483A5 (en) |
GB (1) | GB1359672A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4215978A (en) * | 1978-07-14 | 1980-08-05 | Ube Industries, Ltd. | Resin moulding screws |
US4300839A (en) * | 1977-11-19 | 1981-11-17 | Sekisui Kagaku Kogyo Kabushiki Kaisha | Self-cleaning type extruder |
GB2184975B (en) * | 1985-05-02 | 1989-07-12 | Robert F Dray | Method and apparatus for melting and conveying plasticated material |
CN111791460A (en) * | 2020-07-20 | 2020-10-20 | 诺博橡胶制品有限公司 | Screw and extruder |
WO2022097076A1 (en) * | 2020-11-09 | 2022-05-12 | Pomini Rubber & Plastics S.R.L. | Screw and twin-screw assembly for use in elastomer mixture extruders and associated method for extrusion of elastomer mixtures |
EP4282617A1 (en) * | 2022-05-23 | 2023-11-29 | Jeffrey A. Myers | No solid bed extruder screw with varying width sub-channels |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128341A (en) * | 1977-04-29 | 1978-12-05 | Ingersoll-Rand Co. | Extruder screw |
DE3615209A1 (en) * | 1986-05-06 | 1987-11-12 | Bayer Ag | MULTI-SHAFT SCREW MACHINE WITH CUTTING ELEMENTS |
-
1971
- 1971-05-10 FR FR7116825A patent/FR2093483A5/fr not_active Expired
- 1971-05-27 GB GB1765471A patent/GB1359672A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4300839A (en) * | 1977-11-19 | 1981-11-17 | Sekisui Kagaku Kogyo Kabushiki Kaisha | Self-cleaning type extruder |
US4215978A (en) * | 1978-07-14 | 1980-08-05 | Ube Industries, Ltd. | Resin moulding screws |
GB2184975B (en) * | 1985-05-02 | 1989-07-12 | Robert F Dray | Method and apparatus for melting and conveying plasticated material |
CN111791460A (en) * | 2020-07-20 | 2020-10-20 | 诺博橡胶制品有限公司 | Screw and extruder |
CN111791460B (en) * | 2020-07-20 | 2022-03-25 | 诺博橡胶制品有限公司 | Screw and extruder |
WO2022097076A1 (en) * | 2020-11-09 | 2022-05-12 | Pomini Rubber & Plastics S.R.L. | Screw and twin-screw assembly for use in elastomer mixture extruders and associated method for extrusion of elastomer mixtures |
EP4282617A1 (en) * | 2022-05-23 | 2023-11-29 | Jeffrey A. Myers | No solid bed extruder screw with varying width sub-channels |
Also Published As
Publication number | Publication date |
---|---|
FR2093483A5 (en) | 1972-01-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |