FR2438252A1 - METHOD, APPARATUS AND DEVICE FOR MEASURING VARIATIONS IN THE THICKNESS OF A PLASTIC SHEET - Google Patents

METHOD, APPARATUS AND DEVICE FOR MEASURING VARIATIONS IN THE THICKNESS OF A PLASTIC SHEET

Info

Publication number
FR2438252A1
FR2438252A1 FR7924377A FR7924377A FR2438252A1 FR 2438252 A1 FR2438252 A1 FR 2438252A1 FR 7924377 A FR7924377 A FR 7924377A FR 7924377 A FR7924377 A FR 7924377A FR 2438252 A1 FR2438252 A1 FR 2438252A1
Authority
FR
France
Prior art keywords
thickness
contact
frequency
plastic sheet
oscillator
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.)
Granted
Application number
FR7924377A
Other languages
French (fr)
Other versions
FR2438252B3 (en
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.)
Winzen International Inc
Original Assignee
Winzen International 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
Application filed by Winzen International Inc filed Critical Winzen International Inc
Publication of FR2438252A1 publication Critical patent/FR2438252A1/en
Application granted granted Critical
Publication of FR2438252B3 publication Critical patent/FR2438252B3/fr
Granted 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
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
    • G01B7/087—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means for measuring of objects while moving
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/002—Automatic recalibration
    • G01D18/006—Intermittent recalibration
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92238—Electrical properties
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

LA PRESENTE INVENTION CONCERNE UN PROCEDE, UN DISPOSITIF ET UN APPAREIL POUR LA MESURE DE L'EPAISSEUR D'UN CORPS DIELECTRIQUE. SELON L'INVENTION UN DETECTEUR CAPACITIF EST MIS EN CONTACT AVEC LE CORPS ELECTRIQUE ET DEPLACE EN DIRECTION TRANSVERSALE A CELUI-CI; LE DETECTEUR, QUI COMPREND UNE ELECTRODE EN CONTACT AVEC LA FEUILLE, DETERMINE LA FREQUENCE D'UN OSCILLATEUR DONT LE SIGNAL EST COMPARE AVEC UNE FREQUENCE DE REFERENCE POUR OBTENIR UN SIGNAL PROPORTIONNEL A L'EPAISSEUR DU CORPS DIELECTRIQUE; LE SECOND OSCILLATEUR EST PERIODIQUEMENT RECALIBRE EN COMPARANT SA FREQUENCE A CELLE DU PREMIER OSCILLATEUR, QUAND CELUI-CI EST HORS DE CONTACT AVEC LA MATIERE DIELECTRIQUE, ET EN AJUSTANT LA FREQUENCE SI NECESSAIRE. LE DETECTEUR CAPACITIF COMPREND UN BOITIER CREUX MUNI, DANS UNE SURFACE DESTINEE A ETRE EN CONTACT AVEC LA MATIERE DIELECTRIQUE, D'UNE FENTE DANS LAQUELLE EST MONTEE LADITE ELECTRODE DANS LE MEME PLAN QUE LADITE SURFACE. L'INVENTION EST PARTICULIEREMENT UTILE POUR LA MESURE DE L'EPAISSEUR DE FEUILLE EN MATIERE PLASTIQUE.THE PRESENT INVENTION CONCERNS A PROCESS, A DEVICE AND AN APPARATUS FOR MEASURING THE THICKNESS OF A DIELECTRIC BODY. ACCORDING TO THE INVENTION A CAPACITIVE DETECTOR IS PLACED IN CONTACT WITH THE ELECTRICAL BODY AND MOVED IN CROSS DIRECTION THEREOF; THE DETECTOR, WHICH INCLUDES AN ELECTRODE IN CONTACT WITH THE SHEET, DETERMINES THE FREQUENCY OF AN OSCILLATOR WHOSE SIGNAL IS COMPARED WITH A REFERENCE FREQUENCY TO OBTAIN A SIGNAL PROPORTIONAL TO THE THICKNESS OF THE DIELECTRIC BODY; THE SECOND OSCILLATOR IS PERIODICALLY RECALIBRATED BY COMPARING ITS FREQUENCY WITH THAT OF THE FIRST OSCILLATOR, WHEN THE latter IS OUT OF CONTACT WITH THE DIELECTRIC MATERIAL, AND BY ADJUSTING THE FREQUENCY IF NECESSARY. THE CAPACITIVE DETECTOR INCLUDES A HOLLOW HOUSING MOUNTED, IN A SURFACE INTENDED TO BE IN CONTACT WITH THE DIELECTRIC MATERIAL, WITH A SLOT IN WHICH THE SAID ELECTRODE IS MOUNTED IN THE SAME PLANE AS THE SAID SURFACE. THE INVENTION IS PARTICULARLY USEFUL FOR MEASURING THE THICKNESS OF A PLASTIC SHEET.

FR7924377A 1978-10-03 1979-10-01 METHOD, APPARATUS AND DEVICE FOR MEASURING VARIATIONS IN THE THICKNESS OF A PLASTIC SHEET Granted FR2438252A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US94675178A 1978-10-03 1978-10-03

Publications (2)

Publication Number Publication Date
FR2438252A1 true FR2438252A1 (en) 1980-04-30
FR2438252B3 FR2438252B3 (en) 1981-08-14

Family

ID=25484941

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7924377A Granted FR2438252A1 (en) 1978-10-03 1979-10-01 METHOD, APPARATUS AND DEVICE FOR MEASURING VARIATIONS IN THE THICKNESS OF A PLASTIC SHEET

Country Status (7)

Country Link
JP (1) JPS5550102A (en)
BE (1) BE879123A (en)
DE (1) DE2939739A1 (en)
FR (1) FR2438252A1 (en)
GB (1) GB2038483B (en)
IT (1) IT1123410B (en)
NL (1) NL7907279A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223198A2 (en) * 1985-11-12 1987-05-27 Somar Corporation Apparatus for peeling a film stuck on a board
EP0289212A1 (en) * 1987-04-22 1988-11-02 Watkiss Automation Limited Sensor

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3714615A1 (en) * 1987-05-01 1988-11-17 Bwg Bergwerk Walzwerk DEVICE FOR DETECTING AT LEAST THE CROSS-BENDING OF TAPE TREATMENT PLANTS THROUGH METAL TAPES
US4947131A (en) * 1989-04-21 1990-08-07 Modern Controls, Inc. Capacitance bar sensor
US5030918A (en) * 1989-11-17 1991-07-09 Modern Controls, Inc. Portable gauge for measuring thickness variations of thin plastic film
DE4009982C2 (en) * 1990-03-28 2000-11-02 Windmoeller & Hoelscher Method for measuring the thickness of warm extruded foils made of thermoplastic
DE4323091A1 (en) * 1993-07-10 1995-01-12 Heidelberger Druckmasch Ag Arrangement for monitoring the position of a web edge on a web transporting drum
DE4431934B4 (en) * 1994-09-08 2006-04-27 Heidelberger Druckmaschinen Ag Non-contact double sheet control device
DE19732281C2 (en) * 1997-07-26 1999-09-16 Roehm Gmbh Device for measuring the average web thickness of multi-wall sheets
EP1182423B1 (en) 2000-08-24 2004-01-07 Plast-Control Gerätebau GmbH Sensor for measuring capacitively the tickness of sheets
EP1205293B1 (en) * 2000-11-10 2006-07-12 Plast-Control Gerätebau GmbH Methods of measuring the thickness of multi-layer films

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0223198A2 (en) * 1985-11-12 1987-05-27 Somar Corporation Apparatus for peeling a film stuck on a board
EP0223198A3 (en) * 1985-11-12 1988-09-21 Somar Corporation Film peeling apparatus having film end detector
EP0289212A1 (en) * 1987-04-22 1988-11-02 Watkiss Automation Limited Sensor

Also Published As

Publication number Publication date
JPS5550102A (en) 1980-04-11
NL7907279A (en) 1980-04-09
IT1123410B (en) 1986-04-30
GB2038483B (en) 1983-07-20
DE2939739A1 (en) 1980-04-17
GB2038483A (en) 1980-07-23
BE879123A (en) 1980-02-01
IT7926182A0 (en) 1979-10-02
FR2438252B3 (en) 1981-08-14

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