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THICKNESS GAUGES

Non-contact laser systems for measuring the thickness of sheet and web materials right on the production line. The system measures thickness in several cross-sections at once and also keeps track of web length and line speed. All the cases below are built on one common measuring module, adapted to the material, the line and the working conditions of each customer.

Common module

One measuring module for every case

HOW IT WORKS

Laser sensors on both sides of the web measure its thickness by the differential method, without touching the material. Soft, sticky, hot or freshly produced surfaces are measured without leaving a mark. The system also detects emergencies such as a web break.

It measures all kinds of opaque materials: paper, rubber, polymers, linoleum and other floor coverings, metal and food sheets.

FEEDBACK CONTROL

New: the system can be fitted with a feedback unit that controls external equipment, for example the gap between forming rolls or the pressure of a grinding machine. Up to 16 control channels.

A recent installation: a 2000 mm wide web with 20 thickness measuring points and feedback control of the grinding line.

MEASURABLE PARAMETERS

  • web thickness
  • web width (option)
  • web colour (option)
  • line speed
  • web length

SPECIFICATION

  • thickness: 0 to 5 mm
  • thickness accuracy: 0.01 mm
  • line speed: up to 2 m/s
  • measuring principle: laser differential
  • results output: operator panel, web interface, signal tower
  • web break alarm: yes
  • temperature drift compensation: yes
  • stabilising rollers: yes
  • web skew indication: yes

CUSTOM VERSION

  • thickness: 0 to 500 mm
  • thickness accuracy: 0.005 mm
  • line speed: up to 10 m/s
  • results output: operator panel, web interface, signal tower, plant control system (MES/SCADA), cloud storage
Steel tapeSteel tape 2Steel tape 3Steel tape 4Steel tape 5Steel tape 6
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Case 01

Steel tape

A steel strip line is one of the toughest places for any measuring instrument: constant vibration, strip flutter, oil mist, scale and dust. For this line the module was built for rugged conditions. Stabilising rollers calm the strip right at the measuring point, and the differential laser method cancels out the vibration that is left, because both sensors see the strip move together. Temperature drift compensation keeps readings stable through the whole shift, and the signal tower tells the operator at a glance when the strip goes out of tolerance.

Inspection of thickness of paperInspection of thickness of paper 2Inspection of thickness of paper 3Inspection of thickness of paper 4Inspection of thickness of paper 5
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Case 02

Inspection of thickness of paper

Paper is thin, light and easily marked, so contact gauges can scratch or even tear the web. The laser module measures paper thickness without touching it, at several points across the web, with an accuracy of 0.01 mm. A web break is detected the moment it happens, and the operator sees the thickness across the width, so the process can be corrected long before a whole reel goes to waste.

Food industryFood industry 2Food industry 3Food industry 4Food industry 5Food industry 6
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Case 03

Food industry

In food production, hygiene comes first and nothing should touch the product. Non-contact laser measurement checks the thickness and geometry of food sheets, such as chewing gum, dough or confectionery layers, right on the line, without any risk of contamination and without slowing production down. Even thickness means even portion weight: less giveaway, fewer rejects and a product that looks the same in every pack.

Carpeting and linoleumCarpeting and linoleum 2Carpeting and linoleum 3Carpeting and linoleum 4Carpeting and linoleum 5Carpeting and linoleum 6Carpeting and linoleum 7
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Case 04

Carpeting and linoleum

Floor coverings are made in wide webs, and their thickness has to stay even from edge to edge and along the whole roll. Several laser measuring points across the width check the thickness in real time, while the system records web length and line speed for every roll. With the feedback unit, the system can adjust the rolls or the grinding pressure by itself, keeping the product within tolerance without waiting for the operator.

Steel cord thickness measurementSteel cord thickness measurement 2Steel cord thickness measurement 3Steel cord thickness measurement 4Steel cord thickness measurement 5Steel cord thickness measurement 6Steel cord thickness measurement 7Steel cord thickness measurement 8
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Case 05

Steel cord thickness measurement

Steel cord is a rubber-coated web reinforced with fine steel wires, and its quality depends on more than thickness alone. For this line the system is built on high-speed 2D laser scanners. Instead of measuring single points, each scanner captures the full cross-section profile of the web many times a second. As well as thickness and the usual parameters such as width, length and line speed, the system measures the product's profile and microstructure. It shows the shape of the surface, the position of the cords under the rubber and local defects that a point gauge would miss.

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