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GB1378793A - Extruder - Google Patents

Extruder

Info

Publication number
GB1378793A
GB1378793A GB605972A GB605972A GB1378793A GB 1378793 A GB1378793 A GB 1378793A GB 605972 A GB605972 A GB 605972A GB 605972 A GB605972 A GB 605972A GB 1378793 A GB1378793 A GB 1378793A
Authority
GB
United Kingdom
Prior art keywords
melt
gas
flow barrier
gap
extruder screw
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
GB605972A
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.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
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
Priority to BE794766D priority Critical patent/BE794766A/en
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to GB605972A priority patent/GB1378793A/en
Priority to CA161,484A priority patent/CA1007410A/en
Priority to FR7304278A priority patent/FR2171230B1/fr
Priority to IT67269/73A priority patent/IT977738B/en
Priority to NL7301695A priority patent/NL7301695A/xx
Priority to DE2305914A priority patent/DE2305914A1/en
Priority to JP48014838A priority patent/JPS4892461A/ja
Publication of GB1378793A publication Critical patent/GB1378793A/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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • B29C44/3449—Feeding the blowing agent through the screw
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • 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
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
    • 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)
  • Molding Of Porous Articles (AREA)

Abstract

1378793 Extruder screw SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ NV 9 Feb 1972 6059/72 Heading B5A Gas is fed to or from a polymer melt through a passage 13 in an extruder screw 3 which has a flow barrier 14 between two adjacent turns of the flight 18, the leading turn of which has a gap 15 adjacent the flow barrier so that the melt flows through the gap and has a large surface area exposed to the gas in the pocket behind the flow barrier 14. The arrangement may be repeated to increase gas transfer. Gases evolved from the melt may be removed by vacuum or pressurized nitrogen from a gas cylinder fed into a P.V.C. melt to form a foamed tube.
GB605972A 1972-02-09 1972-02-09 Extruder Expired GB1378793A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BE794766D BE794766A (en) 1972-02-09 EXTRUCTION DEVICE
GB605972A GB1378793A (en) 1972-02-09 1972-02-09 Extruder
CA161,484A CA1007410A (en) 1972-02-09 1973-01-17 Worm screw extruder provided with a flow barrier and bore
FR7304278A FR2171230B1 (en) 1972-02-09 1973-02-07
IT67269/73A IT977738B (en) 1972-02-09 1973-02-07 SCREW EXTRUDER
NL7301695A NL7301695A (en) 1972-02-09 1973-02-07
DE2305914A DE2305914A1 (en) 1972-02-09 1973-02-07 SCREW EXTRUDER
JP48014838A JPS4892461A (en) 1972-02-09 1973-02-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB605972A GB1378793A (en) 1972-02-09 1972-02-09 Extruder

Publications (1)

Publication Number Publication Date
GB1378793A true GB1378793A (en) 1974-12-27

Family

ID=9807671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB605972A Expired GB1378793A (en) 1972-02-09 1972-02-09 Extruder

Country Status (8)

Country Link
JP (1) JPS4892461A (en)
BE (1) BE794766A (en)
CA (1) CA1007410A (en)
DE (1) DE2305914A1 (en)
FR (1) FR2171230B1 (en)
GB (1) GB1378793A (en)
IT (1) IT977738B (en)
NL (1) NL7301695A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5220490A (en) * 1990-10-25 1993-06-15 Microelectronics And Computer Technology Corporation Substrate interconnect allowing personalization using spot surface links

Also Published As

Publication number Publication date
JPS4892461A (en) 1973-11-30
NL7301695A (en) 1973-08-13
FR2171230B1 (en) 1977-04-22
IT977738B (en) 1974-09-20
BE794766A (en) 1973-07-31
DE2305914A1 (en) 1973-08-16
FR2171230A1 (en) 1973-09-21
CA1007410A (en) 1977-03-29

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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