GB711875A - An improved mixing screw for plastic materials - Google Patents
An improved mixing screw for plastic materialsInfo
- Publication number
- GB711875A GB711875A GB3434/52A GB343452A GB711875A GB 711875 A GB711875 A GB 711875A GB 3434/52 A GB3434/52 A GB 3434/52A GB 343452 A GB343452 A GB 343452A GB 711875 A GB711875 A GB 711875A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screw
- plastic material
- thread
- centre portion
- centre
- 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
- B29C48/56—Screws having grooves or cavities other than the thread or the channel
-
- 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
711,875. Mixing appliances. JACKSON & CHURCH CO. Feb. 8, 1952 [Aug. 13, 1951], No. 3434/52. Class 86 [Also in Group V] An apparatus for working a plastic material particularly vinyl plastics includes a screw rotating within a cylindrical chamber to advance the material therethrough, the screw having a helical thread of constant outside diameter with a central section whose root diameter is enlarged with respect to the end sections. The screw rotates within a cylindrical chamber 6 and feeds plastic material from a hopper 8 to an outlet at the end 16 which may be provided with moulds or extrusion dies, not shown. A helical thread 11 of constant lead and constant outside diameter extends along an output portion 3 of the screw and along a centre portion 5 of the screw, the root diameter of which centre portion progressively increases towards its centre. The centre portion 5 has a pair of auxiliary threads 13 and 14 having the same lead as the thread 11. The input portion 4 of the screw has a thread 12 having the same outside diameter and root diameter as the thread 11 but having a somewhat larger lead. The reduction of the cross sectional area presented to the flowing plastic material as it passes from the input portion 4 to the centre portion 5, due to the increase in root diameter and to the addition of the auxiliary threads, causes the plastic material to be squirted through the centre portion at a speed higher than the speed of the surface of the screw over which it moves. The cross sectional area is reduced by a factor :greater, preferably 2 to 6 times greater, than unity divided by the percentage efficiency of the input end portion of the screw, the percentage efficiency being the percentage ratio between the distance the plastic material is advanced by one rotation of the screw and the distance a nut would be advanced by one rotation of the screw. Specification 684,582 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US317568XA | 1951-08-13 | 1951-08-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB711875A true GB711875A (en) | 1954-07-14 |
Family
ID=21861229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3434/52A Expired GB711875A (en) | 1951-08-13 | 1952-02-08 | An improved mixing screw for plastic materials |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE507015A (en) |
CH (1) | CH317568A (en) |
DE (1) | DE969585C (en) |
FR (1) | FR1048719A (en) |
GB (1) | GB711875A (en) |
LU (1) | LU31085A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1174054B (en) * | 1950-03-07 | 1964-07-16 | Nat Rubber Machinery Co | Screw extruder, in particular for processing rubber and plastics |
DE1131389B (en) * | 1955-11-24 | 1962-06-14 | Werner & Pfleiderer | Continuous mixing and kneading device for producing mixtures, in particular rubber and plastic mixtures |
GB1012766A (en) * | 1962-08-09 | 1965-12-08 | Shell Int Research | Screw extruder for extruding plastic materials |
GB1504945A (en) * | 1975-04-12 | 1978-03-22 | Iddon Bros Ltd | Scrolls for extruding machines |
DE3227443C1 (en) * | 1982-07-22 | 1984-02-09 | Windmöller & Hölscher, 4540 Lengerich | Funnel piece of a single-screw extrusion press |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2519014A (en) * | 1946-05-20 | 1950-08-15 | Lucas County Bank | Compounding and molding machine |
LU28734A1 (en) * | 1946-12-21 | 1900-01-01 | ||
FR964617A (en) * | 1947-04-12 | 1950-08-19 | Pirelli | Continuous mixer for the production of mixtures of rubber or other plastics |
NL131363C (en) * | 1965-06-09 | Hoechst Ag |
-
0
- BE BE507015D patent/BE507015A/xx unknown
- LU LU31085D patent/LU31085A1/xx unknown
-
1951
- 1951-11-07 FR FR1048719D patent/FR1048719A/en not_active Expired
- 1951-11-30 DE DEH10595A patent/DE969585C/en not_active Expired
- 1951-12-03 CH CH317568D patent/CH317568A/en unknown
-
1952
- 1952-02-08 GB GB3434/52A patent/GB711875A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE969585C (en) | 1958-06-19 |
FR1048719A (en) | 1953-12-23 |
CH317568A (en) | 1956-11-30 |
LU31085A1 (en) | 1900-01-01 |
BE507015A (en) | 1900-01-01 |
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