GB772739A - A method of and apparatus for continuously indicating the thickness of a moving fibrous web - Google Patents

A method of and apparatus for continuously indicating the thickness of a moving fibrous web

Info

Publication number
GB772739A
GB772739A GB1445454A GB1445454A GB772739A GB 772739 A GB772739 A GB 772739A GB 1445454 A GB1445454 A GB 1445454A GB 1445454 A GB1445454 A GB 1445454A GB 772739 A GB772739 A GB 772739A
Authority
GB
United Kingdom
Prior art keywords
web
thickness
air spaces
voltage
electrodes
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
GB1445454A
Inventor
Kenneth George Orwell Brereton
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.)
BRITTAINS Ltd
Original Assignee
BRITTAINS 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 BRITTAINS Ltd filed Critical BRITTAINS Ltd
Priority to GB1445454A priority Critical patent/GB772739A/en
Publication of GB772739A publication Critical patent/GB772739A/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
    • 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

Landscapes

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

Abstract

772,739. Electric correspondence control systems. BRITTAINS, Ltd. May 17, 1955 [May 17, 1954], No. 14454/54. Class 40 (1). [Also in Group XXXVI] In a method of determining the thickness of a fibrous web a controlled discharge is caused to pass through the air spaces in the web and the voltage required to initiate such discharge is measured. The air spaces approximate in length to the thickness of the web so that measuring the D.C. or A.C. voltage required to produce ionization of the air in the air spaces indicates the thickness of the web. In Fig. 1 a continuously moving paper web W passes between and in contact with electrode rollers E1, E2 and a capacitor C charges through resistor R1 and discharges through current limiting resistor R2 and the air spaces or channels in the paper web W in contact with electrodes E1, E2. The ionization voltage across web W as measured on voltmeter V continuously indicates the thickness of web W at a known apparent density. The roller E2 is earthed and rotates about a fixed axis and roller E1 has an adjustable position and is connected to the negative side of the D.C. voltage applied to C/R1. The electrodes may be of semiconducting material, or may be constructed of metal with a continuous surface or a surface interrupted with insulating segments. A bridge circuit utilizing an instrument recording the thickness is described, Fig. 3 (not shown).
GB1445454A 1954-05-17 1954-05-17 A method of and apparatus for continuously indicating the thickness of a moving fibrous web Expired GB772739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1445454A GB772739A (en) 1954-05-17 1954-05-17 A method of and apparatus for continuously indicating the thickness of a moving fibrous web

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1445454A GB772739A (en) 1954-05-17 1954-05-17 A method of and apparatus for continuously indicating the thickness of a moving fibrous web

Publications (1)

Publication Number Publication Date
GB772739A true GB772739A (en) 1957-04-17

Family

ID=10041472

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1445454A Expired GB772739A (en) 1954-05-17 1954-05-17 A method of and apparatus for continuously indicating the thickness of a moving fibrous web

Country Status (1)

Country Link
GB (1) GB772739A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009039672A1 (en) * 2007-09-26 2009-04-02 Uster Technologies Ag Device and method for measuring the winding weight or winding thickness at the inlet of a carding machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009039672A1 (en) * 2007-09-26 2009-04-02 Uster Technologies Ag Device and method for measuring the winding weight or winding thickness at the inlet of a carding machine

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