GB1279663A - Improved extruder screw - Google Patents

Improved extruder screw

Info

Publication number
GB1279663A
GB1279663A GB54480/69A GB5448069A GB1279663A GB 1279663 A GB1279663 A GB 1279663A GB 54480/69 A GB54480/69 A GB 54480/69A GB 5448069 A GB5448069 A GB 5448069A GB 1279663 A GB1279663 A GB 1279663A
Authority
GB
United Kingdom
Prior art keywords
channel
screw
flight
depth
over
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
GB54480/69A
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.)
Midland Ross Corp
Original Assignee
Midland Ross Corp
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 Midland Ross Corp filed Critical Midland Ross Corp
Publication of GB1279663A publication Critical patent/GB1279663A/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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/60—Screws
    • 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)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

1279663 Extruder Screw MIDLAND-ROSS CORP 6 Nov 1969 [14 Feb 1969] 54480/69 Heading B5A The efficiency of melting of particulate thermoplastics material e.g. polyvinyl chloride, within the heated barrel of a screw extruder, is improved by utilizing, in the melting region of the screw, the displacing action of the interior barrel surface to constantly displace material, melted in contact therewith, from a screw channel 10 of progressively decreasing volume effected by constantly decreasing depth, over an intervening land 12 into an adjacent channel 11 of constantly increasing volume. The screw feed section comprises a single channel 8 of constant root diameter and pitch, connected to the melting region by a short transition region wherein the flight width 7 is increased to decrease the width of the channel over a portion 10a to that of the portion 10 which remains constant throughout the melting region as the depth thereof decreasss. The adjacent channel 11 of progressively increasing depth is commenced at the melting zone in the widened flight at 14, to be defined between a trailing flight portion 16 and a leading flight portion 12 of lesser height providing the intervening land over which the molten material is displaced. The trailing edge 6 of the flight is of constant pitch throughout the screw. The channel 11 is merged over a short transition section, to a metering section 11b of decreased depth and increased width. The barrel is heated either by electric strip heaters, or by fluid jackets. The feed section may alternatively comprise a channel of the same width as channel 10, but of decreasing depth theretowards.
GB54480/69A 1969-02-14 1969-11-06 Improved extruder screw Expired GB1279663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79943069A 1969-02-14 1969-02-14

Publications (1)

Publication Number Publication Date
GB1279663A true GB1279663A (en) 1972-06-28

Family

ID=25175895

Family Applications (1)

Application Number Title Priority Date Filing Date
GB54480/69A Expired GB1279663A (en) 1969-02-14 1969-11-06 Improved extruder screw

Country Status (2)

Country Link
DE (1) DE1958419A1 (en)
GB (1) GB1279663A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175244A (en) * 1985-04-01 1986-11-26 Toshiba Machine Co Ltd Screw adapted for plastic moulding
GB2180496A (en) * 1985-09-09 1987-04-01 Sterling Extruder Corp Extruder screw
US10624382B2 (en) 2017-06-01 2020-04-21 Wenger Manufacturing Inc. High specific mechanical energy extrusion screw assembly
EP3865277A1 (en) * 2020-02-17 2021-08-18 Robert A. Barr Extruder screw without a solid bed

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173445A (en) * 1978-07-17 1979-11-06 Monsanto Company Plastics extrusion apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175244A (en) * 1985-04-01 1986-11-26 Toshiba Machine Co Ltd Screw adapted for plastic moulding
GB2175244B (en) * 1985-04-01 1989-08-23 Toshiba Machine Co Ltd Screw adapted for plastic formation
GB2180496A (en) * 1985-09-09 1987-04-01 Sterling Extruder Corp Extruder screw
US4733970A (en) * 1985-09-09 1988-03-29 Sterling Extruder Corporation Extruder screw
GB2180496B (en) * 1985-09-09 1989-09-20 Sterling Extruder Corp Extruder screw
US10624382B2 (en) 2017-06-01 2020-04-21 Wenger Manufacturing Inc. High specific mechanical energy extrusion screw assembly
US11254041B2 (en) 2017-06-01 2022-02-22 Wenger Manufacturing Inc. High specific mechanical energy extrusion screw assembly
EP3865277A1 (en) * 2020-02-17 2021-08-18 Robert A. Barr Extruder screw without a solid bed
US11285652B2 (en) 2020-02-17 2022-03-29 Robert A. Barr No solid bed extruder screw

Also Published As

Publication number Publication date
DE1958419A1 (en) 1970-09-03

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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