GB711875A - An improved mixing screw for plastic materials - Google Patents

An improved mixing screw for plastic materials

Info

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
Application number
GB3434/52A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jackson and Church Co
Original Assignee
Jackson and Church Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jackson and Church Co filed Critical Jackson and Church Co
Publication of GB711875A publication Critical patent/GB711875A/en
Expired legal-status Critical Current

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

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.
GB3434/52A 1951-08-13 1952-02-08 An improved mixing screw for plastic materials Expired GB711875A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519014A (en) * 1946-05-20 1950-08-15 Lucas County Bank Compounding and molding machine
BE470057A (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
NL135214C (en) * 1965-06-09 1900-01-01 Hoechst Ag

Also Published As

Publication number Publication date
CH317568A (en) 1956-11-30
FR1048719A (en) 1953-12-23
LU31085A1 (en) 1900-01-01
DE969585C (en) 1958-06-19
BE507015A (en) 1900-01-01

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