GB1431978A - Process and apparatus for removing volatile components of materials - Google Patents

Process and apparatus for removing volatile components of materials

Info

Publication number
GB1431978A
GB1431978A GB5970373A GB5970373A GB1431978A GB 1431978 A GB1431978 A GB 1431978A GB 5970373 A GB5970373 A GB 5970373A GB 5970373 A GB5970373 A GB 5970373A GB 1431978 A GB1431978 A GB 1431978A
Authority
GB
United Kingdom
Prior art keywords
screw
zone
gas
pressure
plastics
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
GB5970373A
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.)
WELDING ENG Inc
Original Assignee
WELDING ENG Inc
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 claimed from US00117332A external-priority patent/US3799234A/en
Priority to US401360A priority Critical patent/US3917507A/en
Priority claimed from US401360A external-priority patent/US3917507A/en
Application filed by WELDING ENG Inc filed Critical WELDING ENG Inc
Priority to GB5970373A priority patent/GB1431978A/en
Priority to FR7347032A priority patent/FR2256025A1/en
Priority claimed from FR7347032A external-priority patent/FR2256025A1/en
Priority to BE139529A priority patent/BE809407A/en
Publication of GB1431978A publication Critical patent/GB1431978A/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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/834—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
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
    • 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
    • B29C48/63—Screws having sections without mixing elements or threads, i.e. having cylinder shaped sections
    • 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
    • B29C48/68—Barrels or cylinders
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/686—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having grooves or cavities
    • 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
    • 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
    • B29C48/762—Vapour stripping
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/82—Cooling

Abstract

1431978 Evaporating solvent from plastics WELDING ENGS INC 22 Dec 1973 59703/73 Heading BIB [Also in Divisions B4 and B5] A volatile component is removed from a plastics material in a screw extruder, by a gas which is injected into the material in a zone of the extruder to flow in the opposite direction to that in which the material is being delivered by the extruder screw. The gas is injected at 28 at a location in the zone 27 at which the material fully fills the screw flight and is at a pressure which is lower than that of the gas and of the material downstream thereof, but is higher than at an upstream location 34 at which the gas and volatile component are vented. The described apparatus comprises a non-intermeshing twin-screw extruder heated by a jacket 16 and which, upstream of the zone 27 comprises a zone, or more than one zone, separated by cylindrical or reverse pitch screw segments, in which vapour is removed e.g. at above atmospheric pressure, by a vent 20 adjacent a reduced diameter shaft section 22 of the screws. The zone 27 is defined between pressure sealing cylindrical, or reverse thread, screw segments 24, 26, and a lower pressure of material adjacent vent 34 is maintained by a reduced diameter screw shaft with the higher pressure adjacent location 28 being maintained by the segment 26 and a decreased screw pitch ensuring that the screw is filled. The gas and component are removed at atmospheric pressure, or under vacuum at 34, with intermeshing twin screws 30, 32 being provided to return any escaping plastics material. Downstream of zone 27, water may be injected to effect cooling of the plastics, being removed as vapour under reduced pressure at 38 together with some of the gas injected at 28. The plastics may comprise polystyrene, polypropylene and polycarbonates, but the examples relate to polyethylene from which hexane or a mixed hexane-cyclohexane solvent volatile component is removed by steam.
GB5970373A 1971-02-22 1973-12-22 Process and apparatus for removing volatile components of materials Expired GB1431978A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US401360A US3917507A (en) 1971-02-22 1973-09-27 Countercurrent combined liquid and vapor stripping in screw devolatilizer
GB5970373A GB1431978A (en) 1971-02-22 1973-12-22 Process and apparatus for removing volatile components of materials
FR7347032A FR2256025A1 (en) 1973-12-22 1973-12-28 Removal of volatile material from screw feed extruder - by injecting gas into high press. zone of plastic melt and removing it from low press. zone
BE139529A BE809407A (en) 1971-02-22 1974-01-04 PROCESS AND DEVICE FOR TRAINING VOLATILE CONSTITUENTS WITH STEAM INSIDE A SCREW EXTRUDER.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US00117332A US3799234A (en) 1971-02-22 1971-02-22 Countercurrent vapor stripping in screw devolatilizer
US401360A US3917507A (en) 1971-02-22 1973-09-27 Countercurrent combined liquid and vapor stripping in screw devolatilizer
GB5970373A GB1431978A (en) 1971-02-22 1973-12-22 Process and apparatus for removing volatile components of materials
FR7347032A FR2256025A1 (en) 1973-12-22 1973-12-28 Removal of volatile material from screw feed extruder - by injecting gas into high press. zone of plastic melt and removing it from low press. zone
BE139529A BE809407A (en) 1971-02-22 1974-01-04 PROCESS AND DEVICE FOR TRAINING VOLATILE CONSTITUENTS WITH STEAM INSIDE A SCREW EXTRUDER.
DE2400271A DE2400271C2 (en) 1971-02-22 1974-01-04 Method and device for expelling volatile components from plastic flowing in the direction of extrusion

Publications (1)

Publication Number Publication Date
GB1431978A true GB1431978A (en) 1976-04-14

Family

ID=27543003

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5970373A Expired GB1431978A (en) 1971-02-22 1973-12-22 Process and apparatus for removing volatile components of materials

Country Status (2)

Country Link
BE (1) BE809407A (en)
GB (1) GB1431978A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4980105A (en) * 1989-08-28 1990-12-25 General Electric Company Method for extruder devolatilization of spiro(bis)indane polycarbonates
WO1999006198A1 (en) * 1997-08-01 1999-02-11 Sedepro Continuous rubber kneader
DE19854689A1 (en) * 1998-11-26 2000-06-08 Buehler Ag Method and device for processing a thermoplastic polycondensate
US6273599B1 (en) 1999-09-17 2001-08-14 Flint Ink Corporation Process for preparing pigment flush
US6576131B1 (en) 1997-12-16 2003-06-10 Flint Ink Corporation Process and apparatus for changing the wetting agent of pigments
ITMI20082348A1 (en) * 2008-12-30 2010-06-30 Meccaniche Luigi Bander A S P A Costruzioni EXPANDED EXPANDED POLYESTER EXTRUSION PROCESS AND EQUIPMENT APPLICABLE TO PRODUCTION OF LEAVES, SHEETS OR EXPANDED POLYESTER TUBES
US7947126B2 (en) 2004-08-17 2011-05-24 Flint Group Incorporated Processes for preparing organic pigment dispersions and ink

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4980105A (en) * 1989-08-28 1990-12-25 General Electric Company Method for extruder devolatilization of spiro(bis)indane polycarbonates
WO1999006198A1 (en) * 1997-08-01 1999-02-11 Sedepro Continuous rubber kneader
WO1999006197A1 (en) * 1997-08-01 1999-02-11 Sedepro Continuous rubber kneader
US6312148B1 (en) 1997-08-01 2001-11-06 Sedepro Societe Anonyme Removal of gaseous phase from continuous mixing chamber for rubber compound
US6576131B1 (en) 1997-12-16 2003-06-10 Flint Ink Corporation Process and apparatus for changing the wetting agent of pigments
DE19854689A1 (en) * 1998-11-26 2000-06-08 Buehler Ag Method and device for processing a thermoplastic polycondensate
US6273599B1 (en) 1999-09-17 2001-08-14 Flint Ink Corporation Process for preparing pigment flush
US6305838B1 (en) * 1999-09-17 2001-10-23 Flint Ink Corporation Process and apparatus for preparing pigment flush
US6348091B1 (en) 1999-09-17 2002-02-19 Flint Ink Corporation Process and apparatus for preparing pigment flush in response to a material property value
US7947126B2 (en) 2004-08-17 2011-05-24 Flint Group Incorporated Processes for preparing organic pigment dispersions and ink
ITMI20082348A1 (en) * 2008-12-30 2010-06-30 Meccaniche Luigi Bander A S P A Costruzioni EXPANDED EXPANDED POLYESTER EXTRUSION PROCESS AND EQUIPMENT APPLICABLE TO PRODUCTION OF LEAVES, SHEETS OR EXPANDED POLYESTER TUBES
WO2010076652A1 (en) * 2008-12-30 2010-07-08 Costruzioni Meccaniche Luigi Bandera S.P.A Foamed polyester extrusion process and equipment which can be used in plants for producing sheets, boards or tubes of foamed polyester

Also Published As

Publication number Publication date
BE809407A (en) 1974-05-02

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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