DE4320666A1 - Strain gauge (foil strain gauge) - Google Patents

Strain gauge (foil strain gauge)

Info

Publication number
DE4320666A1
DE4320666A1 DE4320666A DE4320666A DE4320666A1 DE 4320666 A1 DE4320666 A1 DE 4320666A1 DE 4320666 A DE4320666 A DE 4320666A DE 4320666 A DE4320666 A DE 4320666A DE 4320666 A1 DE4320666 A1 DE 4320666A1
Authority
DE
Germany
Prior art keywords
adhesive
strain gauge
component
gauge according
adhesive layer
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.)
Withdrawn
Application number
DE4320666A
Other languages
German (de)
Inventor
Bernd Hofmann
Bernhard Ptaschek
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.)
Hottinger Bruel and Kjaer GmbH
Original Assignee
Hottinger Baldwin Messtechnik GmbH
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 Hottinger Baldwin Messtechnik GmbH filed Critical Hottinger Baldwin Messtechnik GmbH
Priority to DE4320666A priority Critical patent/DE4320666A1/en
Publication of DE4320666A1 publication Critical patent/DE4320666A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2287—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges constructional details of the strain gauges
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • 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
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L35/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L35/04—Homopolymers or copolymers of nitriles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The invention relates to a strain gauge having a rosette (1) which is attached to one side of a supporting film (backing film) (2), and an adhesive layer (adhesive film) (3) on the other side of the supporting film. In order to permit a particularly simple application of the strain gauge, it is provided that the adhesive layer (3) contains microencapsulated adhesive. <IMAGE>

Description

Die Erfindung betrifft einen Dehnungsmeßstreifen mit einem strukturierten, elektrisch leitenden Meßgitter, welches auf einer Seite einer Trägerfolie angebracht ist, und mit einer Klebstoffschicht auf der anderen Seite der Trägerfolie.The invention relates to a strain gauge with a structured, electrically conductive measuring grid, which on one side of a carrier film is attached, and with one Adhesive layer on the other side of the carrier film.

Derartige Dehnungsmeßstreifen werden zum elektrischen Messen mechanischer Größen, insbesondere in Meßgrößenaufnehmern und in der Spannungsanalyse, eingesetzt. Hierzu wird der Dehnungsmeß­ streifen auf dem betreffenden Bauteil befestigt, was überwie­ gend durch Kleben erfolgt.Such strain gauges are used for electrical measurement mechanical quantities, especially in transducers and in stress analysis. The strain gauge is used for this strips attached to the component in question, what about by gluing.

Bei bekannten Dehnungsmeßstreifen ist hierzu vorgesehen, daß die Verklebung durch Spezial-Klebstoffe vor Ort erfolgt. Dies ist für den Dehnungsmeßstreifen-Anwender durch den separaten Einsatz von Klebstoff mit einem nicht unwesentlichen Aufwand verbunden, zumal hierbei bestimmte Sicherheitsmaßnahmen ein­ zuhalten und entsprechende Vorarbeiten, wie Reinigen, Aufrauhen und Abkleben der Meßstelle, durchzuführen sind. Desweiteren kann das vom Meßgitter erzeugte Signal stark durch die zwangs­ läufig sehr unterschiedlichen Klebeschichtstärken und Kleb­ stoffqualitäten ungünstig beeinflußt werden.In known strain gauges, it is provided that the bonding is done on site using special adhesives. This is for the strain gauge user through the separate Use of adhesive with a not inconsiderable effort connected, especially since certain security measures are taken hold and appropriate preparatory work, such as cleaning, roughening and masking the measuring point. Furthermore can the signal generated by the measuring grid strongly by the compulsory frequently very different adhesive layers and glue fabric qualities are adversely affected.

Der Erfindung liegt daher die Aufgabe zugrunde, einen gattungs­ gemäßen Dehnungsmeßstreifen zu schaffen, der sich durch eine besonders einfache Applikation auszeichnet. Darüberhinaus sol­ len seine Klebeeigenschaften reproduzierbar sein und es soll auch eine Verklebung auf feuchtem oder öligem Untergrund mög­ lich sein.The invention is therefore based on the object, a genus to create appropriate strain gauges, which is characterized by a distinguishes particularly simple application. Furthermore sol len its adhesive properties should be reproducible and it should it can also be glued to a damp or oily surface be.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Klebstoffschicht mikroverkapselten Klebstoff enthält.This object is achieved in that the Adhesive layer contains microencapsulated adhesive.

Ein solcher Dehnungsmeßstreifen enthält also eine Klebeschicht, die bereits beim Dehnungsmeßstreifenhersteller aufgebracht und abgelüftet wird. Erst bei der Applikation wird der verkapselte Klebstoff des Dehnungsmeßstreifens durch Anwendung von Druck- und/oder Scherkräften aktiviert, indem die Mikrokapseln zum Platzen gebracht werden und den Klebstoff freisetzen.Such a strain gauge therefore contains an adhesive layer, already applied by the strain gauge manufacturer and  is vented. The encapsulated is not used until the application Strain gauge adhesive by using pressure and / or shear forces activated by the microcapsules for Burst and release the adhesive.

Der nach dem Aufplatzen der Mikrokapseln freigesetzte Klebstoff bzw. die einsetzende Vermischung der Klebstoffkomponenten er­ möglichen eine Verklebung auch auf feuchtem oder öligem Unter­ grund, da die mit dem Klebstoff vermischten Öl- oder Wasser­ spuren die Klebeeigenschaften kaum beeinflussen.The adhesive released after the microcapsules burst or the beginning mixing of the adhesive components possible gluing also on damp or oily surfaces reason, because the oil or water mixed with the adhesive hardly affect the adhesive properties.

Ein Ausführungsbeispiel der Erfindung sieht vor, daß der mikro­ verkapselte Klebstoff ein Einkomponentenkleber ist. Für die Verklebung auf feuchtem oder öligem Untergrund ist jedoch eine andere Ausführungsform der Erfindung besonders geeignet, die sich dadurch auszeichnet, daß die Klebeschicht als Zweikompo­ nentenkleber ausgebildet ist, dessen eine Komponente verkapselt ist.An embodiment of the invention provides that the micro encapsulated adhesive is a one-component adhesive. For the However, sticking to a damp or oily surface is one another embodiment of the invention particularly suitable, the is characterized in that the adhesive layer as a two-component is formed, one component encapsulates is.

Als Einkomponentenklebstoff eignet sich besonders ein kalthär­ tender Kleber auf Cyanacrylat-Basis oder auf anaerober Basis. Für die Verwendung von Zweikomponentenklebstoffen eignen sich kalt- und warmhärtende Klebstoffe auf Epoxidharz-Basis.A cold-hard adhesive is particularly suitable as a one-component adhesive Tender adhesive based on cyanoacrylate or anaerobic. Are suitable for the use of two-component adhesives Cold and hot curing adhesives based on epoxy resin.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Hierzu zeigt Fig. 1 die Oberseite und Fig. 2 die Unterseite eines erfindungsgemäßen Dehnungsmeßstreifens.An embodiment of the invention is shown in the drawing and will be described in more detail below. For this purpose, 1 FIG. 2 shows the top and Fig. The underside of a strain gauge according to the invention.

Der Dehnungsmeßstreifen besteht aus einem auf einer Trägerfolie 2 befindlichen elektrisch leitfähigen Meßgitter 1, welches z. B. durch einen photolithographischen Prozeß und nachfolgendem Ätzen aus einer Metallfolie heraus geformt wird oder welches durch den Einsatz energiereicher Strahlung, z. B. Röntgenstrah­ lung, durch stellenweise Umwandlung der elektrisch isolierenden Schicht in eine elektrisch leitfähige Schicht erzeugt wird. Das Meßgitter 1 besteht aus einem dehnungsempfindlichen mäan­ derförmigen Abschnitt, welcher mit Anschlußpunkten verbunden ist, welche mit Anschlußdrähten kontaktiert werden können. Auf der in Fig. 2 dargestellten Rückseite wird bereits beim Deh­ nungsmeßstreifen-Hersteller eine Klebstoffschicht 3 aufgetra­ gen, die mikroverkapselten Klebstoff, der durch die Punkte in Fig. 2 angedeutet ist, enthält. Dieser Klebstoff wird erst während der Applikation aktiviert. Das Zerplatzen der Mikro­ kapseln führt zu einem Freiwerden des Klebstoffs oder einer Komponente des Klebstoffs und die Vernetzung des Klebers setzt ein.The strain gauge consists of an electrically conductive measuring grid 1 located on a carrier film 2 , which, for. B. is formed by a photolithographic process and subsequent etching out of a metal foil or which by the use of high-energy radiation, for. B. X-ray radiation, is generated in places by converting the electrically insulating layer into an electrically conductive layer. The measuring grid 1 consists of a strain-sensitive meandering section which is connected to connection points which can be contacted with connection wires. On the back side shown in FIG. 2, an adhesive layer 3 is already applied to the strain gauge manufacturer, which contains microencapsulated adhesive, which is indicated by the points in FIG. 2. This adhesive is only activated during application. The bursting of the microcapsules leads to a release of the adhesive or a component of the adhesive and the crosslinking of the adhesive begins.

Claims (7)

1. Dehnungsmeßstreifen mit einem Meßgitter, welches auf einer Seite einer Trägerfolie aufgebracht ist, und mit einer Klebstoffschicht auf der anderen Seite der Trägerfolie, dadurch gekennzeichnet, daß die Klebstoffschicht (3) mikro­ verkapselten Klebstoff enthält.1. Strain gauge with a measuring grid, which is applied to one side of a carrier film, and with an adhesive layer on the other side of the carrier film, characterized in that the adhesive layer ( 3 ) contains microencapsulated adhesive. 2. Dehnungsmeßstreifen nach Anspruch 1, dadurch gekennzeich­ net, daß der mikroverkapselte Klebstoff ein Einkomponenten­ kleber ist.2. Strain gauge according to claim 1, characterized net that the microencapsulated adhesive is a one-component glue is. 3. Dehnungsmeßstreifen nach Anspruch 1, dadurch gekennzeich­ net, daß die Klebstoffschicht (3) als Zweikomponentenkleber ausgebildet ist, dessen eine Komponente verkapselt ist.3. Strain gauge according to claim 1, characterized in that the adhesive layer ( 3 ) is designed as a two-component adhesive, one component of which is encapsulated. 4. Dehnungsmeßstreifen nach Anspruch 1, dadurch gekennzeich­ net, daß die Klebstoffschicht (3) als Zweikomponenten­ kleber ausgebildet ist, dessen beide Komponenten verkapselt sind.4. Strain gauge according to claim 1, characterized in that the adhesive layer ( 3 ) is designed as a two-component adhesive, the two components of which are encapsulated. 5. Dehnungsmeßstreifen nach Anspruch 2, dadurch gekennzeich­ net, daß als Klebstoff ein kalthärtender Einkomponenten­ kleber auf Cyanacrylat-Basis vorgesehen ist.5. Strain gauge according to claim 2, characterized net that a cold-curing one-component as an adhesive Glue based on cyanoacrylate is provided. 6. Dehnungsmeßstreifen nach Anspruch 2, dadurch gekennzeich­ net, daß als Klebstoff ein kalthärtender Einkomponenten­ kleber auf anaerober Basis vorgesehen ist.6. Strain gauge according to claim 2, characterized net that a cold-curing one-component as an adhesive adhesive is provided on an anaerobic basis. 7. Dehnungsmeßstreifen nach Anspruch 3 oder 4, dadurch gekenn­ zeichnet, daß als Klebstoff ein kalt- und warmhärtender Zweikomponenten Klebstoff auf Epoxidharz-Basis vorgesehen ist.7. Strain gauge according to claim 3 or 4, characterized records that as a glue a cold and warm curing Two-component adhesive based on epoxy resin is provided is.
DE4320666A 1993-06-22 1993-06-22 Strain gauge (foil strain gauge) Withdrawn DE4320666A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4320666A DE4320666A1 (en) 1993-06-22 1993-06-22 Strain gauge (foil strain gauge)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4320666A DE4320666A1 (en) 1993-06-22 1993-06-22 Strain gauge (foil strain gauge)

Publications (1)

Publication Number Publication Date
DE4320666A1 true DE4320666A1 (en) 1995-01-05

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ID=6490918

Family Applications (1)

Application Number Title Priority Date Filing Date
DE4320666A Withdrawn DE4320666A1 (en) 1993-06-22 1993-06-22 Strain gauge (foil strain gauge)

Country Status (1)

Country Link
DE (1) DE4320666A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10335690A1 (en) * 2003-06-04 2004-12-23 Sensor-Technik Wiedemann Gmbh Deformation sensor used for e.g. force, pressure, torque and acceleration measurements in vehicle, is mounted with signal processor circuit on flexible insulation film substrate
EP1560010A1 (en) * 2004-01-27 2005-08-03 Mettler-Toledo GmbH Load cell with strain gauge with adhesive layer of inorganic-organic hybrid-polymer (ORMOCER)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10335690A1 (en) * 2003-06-04 2004-12-23 Sensor-Technik Wiedemann Gmbh Deformation sensor used for e.g. force, pressure, torque and acceleration measurements in vehicle, is mounted with signal processor circuit on flexible insulation film substrate
EP1560010A1 (en) * 2004-01-27 2005-08-03 Mettler-Toledo GmbH Load cell with strain gauge with adhesive layer of inorganic-organic hybrid-polymer (ORMOCER)
US7243558B2 (en) 2004-01-27 2007-07-17 Mettler-Toledo Ag Bonding of strain gauges to the deformable body of a force-measuring cell

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Legal Events

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8141 Disposal/no request for examination