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GB1370946A - Extrusion of thermoplastics materials - Google Patents

Extrusion of thermoplastics materials

Info

Publication number
GB1370946A
GB1370946A GB1487571A GB1487571A GB1370946A GB 1370946 A GB1370946 A GB 1370946A GB 1487571 A GB1487571 A GB 1487571A GB 1487571 A GB1487571 A GB 1487571A GB 1370946 A GB1370946 A GB 1370946A
Authority
GB
United Kingdom
Prior art keywords
pipe
thickness
extrusion
pulse
echo
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
GB1487571A
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.)
WAVIN PLASTICS Ltd
Original Assignee
WAVIN PLASTICS Ltd
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 WAVIN PLASTICS Ltd filed Critical WAVIN PLASTICS Ltd
Priority to GB1487571A priority Critical patent/GB1370946A/en
Priority to FR7217327A priority patent/FR2139545A5/fr
Priority to NL7206516A priority patent/NL7206516A/xx
Priority to DE19722223609 priority patent/DE2223609A1/en
Publication of GB1370946A publication Critical patent/GB1370946A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92447—Moulded article
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92933—Conveying, transporting or storage of articles
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/9298—Start-up, shut-down or parameter setting phase; Emergency shut-down; Material change; Test or laboratory equipment or studies
    • 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
    • B29C48/03—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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

1370946 Controlling extrudate thickness WAVIN PLASTICS Ltd 15 May 1972 [14 May 1971] 14875/71 Heading B5A [Also in Divisions G3 and H4] The thickness of thermoplastics material being extruded is monitored or determined absolutely or comparatively from the propagation time of an ultrasonic pulse transmitted through the thickness of the material while the material is at a temperature above its melting point. In the embodiment described the wall thickness of plastics pipe is monitored where the pipe emerges from a sizing sleeve at an extrusion head and before the pipe passes into a cooling water bath. Four transmit/receive probes spaced at 90 degree intervals around the pipe circumference are reciprocated about the pipe axis to scan the pipe circumference, each probe acting in a pulse-echo mode. The echo-time of a pulse reflected by the inner surface of the pipe is measured, or is compared with the echo-time of a reflection from the pipe outer surface, or is compared with the propagation time of a pulse transmitted through the thickness of a reference plastics specimen maintained at a given temperature. The measurement or comparison result is used to regulate the extrusion apparatus to keep the pipe wall thickness uniform and within prescribed limits, e.g. by varying the extrusion rate or the rate of draw-off of the pipe from the extrusion head or the local temperature of or radial position of the extrusion die. Alternatively an alarm may be actuated if the thickness goes outside the limits. A liquid (e.g. the cooling water) or a profiled solid body is used to couple each probe acoustically to the pipe. A through-transmission measurement mode may be used instead of the pulse-echo mode.
GB1487571A 1971-05-14 1971-05-14 Extrusion of thermoplastics materials Expired GB1370946A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1487571A GB1370946A (en) 1971-05-14 1971-05-14 Extrusion of thermoplastics materials
FR7217327A FR2139545A5 (en) 1971-05-14 1972-05-15
NL7206516A NL7206516A (en) 1971-05-14 1972-05-15
DE19722223609 DE2223609A1 (en) 1971-05-14 1972-05-15 Method and device for detecting and regulating the wall thickness of extruded material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1487571A GB1370946A (en) 1971-05-14 1971-05-14 Extrusion of thermoplastics materials

Publications (1)

Publication Number Publication Date
GB1370946A true GB1370946A (en) 1974-10-16

Family

ID=10049054

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1487571A Expired GB1370946A (en) 1971-05-14 1971-05-14 Extrusion of thermoplastics materials

Country Status (4)

Country Link
DE (1) DE2223609A1 (en)
FR (1) FR2139545A5 (en)
GB (1) GB1370946A (en)
NL (1) NL7206516A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160385A (en) * 1977-06-30 1979-07-10 E. I. Dupont De Nemours And Co. Pipe quality monitoring mechanism
EP0105020A1 (en) * 1982-09-29 1984-04-04 Krautkrämer GmbH Process for the ultrasonic measurement of the wall thickness of synthetic hollow bodies
US4520672A (en) * 1982-08-19 1985-06-04 Saint Amour John D Thickness measuring
US4740146A (en) * 1986-07-25 1988-04-26 Peter Angelbeck Apparatus for measuring and controlling the wall thickness of plastic pipes
AU605265B2 (en) * 1987-04-03 1991-01-10 Cincinnati Milacron Inc. A procedure for manufacturing pipes and sections out of thermoplastic plastics
EP0446533A3 (en) * 1990-01-05 1991-11-27 Unilever Plc Apparatus and method for detecting inhomogeneities in semi-plastic substances through ultrasound
DE4019865A1 (en) * 1990-06-22 1992-01-09 Wieland Werke Ag Wall thickness or non-uniformity measurer for rotating tubes - contains ultrasonic probes movable in radial holder channels with supply to space between probes and tube
US5085567A (en) * 1989-03-01 1992-02-04 INOEX GmbH Innovationen und Ausrugstungen fur die Extrusiontechnik Extrusion system for plastics pipes

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA728754B (en) * 1972-11-18 1973-08-29 Hepworth Plastics Ltd Improvements in or relating to the extrusion of plastics pipes
FR2424127A1 (en) * 1978-04-28 1979-11-23 Fabrications Et Heater power control of concentricity of extruded plastic sheathing - by adjusting flow rates on opposite sides of the die head
DE3304865A1 (en) * 1983-02-12 1984-08-16 Battenfeld Extrusionstechnik GmbH, 4970 Bad Oeynhausen METHOD AND DEVICE FOR KEEPING THE WALL THICKNESS IN THE EXTRUDING OF BLOW FILMS, TUBES OR TUBULAR STRINGS OF PLASTIC
US4490316A (en) * 1983-06-29 1984-12-25 Caterpillar Tractor Co. Apparatus and method for controlling internal size of an extruded hose

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160385A (en) * 1977-06-30 1979-07-10 E. I. Dupont De Nemours And Co. Pipe quality monitoring mechanism
US4520672A (en) * 1982-08-19 1985-06-04 Saint Amour John D Thickness measuring
EP0105020A1 (en) * 1982-09-29 1984-04-04 Krautkrämer GmbH Process for the ultrasonic measurement of the wall thickness of synthetic hollow bodies
US4740146A (en) * 1986-07-25 1988-04-26 Peter Angelbeck Apparatus for measuring and controlling the wall thickness of plastic pipes
AU605265B2 (en) * 1987-04-03 1991-01-10 Cincinnati Milacron Inc. A procedure for manufacturing pipes and sections out of thermoplastic plastics
US5085567A (en) * 1989-03-01 1992-02-04 INOEX GmbH Innovationen und Ausrugstungen fur die Extrusiontechnik Extrusion system for plastics pipes
EP0446533A3 (en) * 1990-01-05 1991-11-27 Unilever Plc Apparatus and method for detecting inhomogeneities in semi-plastic substances through ultrasound
DE4019865A1 (en) * 1990-06-22 1992-01-09 Wieland Werke Ag Wall thickness or non-uniformity measurer for rotating tubes - contains ultrasonic probes movable in radial holder channels with supply to space between probes and tube

Also Published As

Publication number Publication date
FR2139545A5 (en) 1973-01-05
NL7206516A (en) 1972-11-16
DE2223609A1 (en) 1972-11-30

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee