Calipro DML

Measurement of thickness (contactless)

Laser triangulation

The Calipro DML optical system uses laser triangulation online to measure the thickness or coating thickness of various materials with the highest accuracy.

Principle of operation

In principle, the two-sided, non-contact, laser-type thickness gauge can be used to monitor virtually any product in web or sheet form. Successful applications for this technique can be found in the paper and cardboard industry, nonwoven sector, plants manufacturing PVC flooring or other calendered or extruded plastic webs and sheets, and in the manufacture of artificial leather.

Either one or two laser-triangulation sensors determine the exact distance between the gauging sensor(s) and product surface, either from one or both sides.

Depending on the arrangement, an additional sensor, usually a high-precision eddy-current sensor, deter mines either the distance between the two gauging sensors or distance between the one sensor and a reference roller.

Product highlights

  • Non-contact, non-destructive and ultra-precise measurement online of product thickness
  • Available in several configurations to suit various requirements in terms of accuracy
  • Can gauge either at one side against a reference roller or on both sides

Customer benefits

  • Determines the thickness of a web or sheet directly without reference to product density
  • Since the gauge is able to traverse, it indicates the thickness of the product from edge to edge
  • Non-contact measurement has no adverse effect on either product quality or the manufacturing process

Area of application

  • Paper and cardboard industry
  • Nonwoven sector
  • Manufacturing of PVC flooring
  • Calendered or extruded plastic webs and sheets
  • Manufacturing of artificial leather


  • Calipro DML-S: Single sided (against reference roller made of stainless steel)
  • Calipro DML-D: Double sided (one sensor on top and bottom)
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Extrusion 2019

Conference for all extrusion processing
17 - 19 Sept 2019
Chicago, USA



International Trade Fair for Plastic and Rubbery Machines
16 - 23 Oct 2019
Düsseldorf, Germany
Visit us at stand 10G21


Hofer Vliesstofftage

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Conference for fleece
06 - 07 Nov 2019
Hof, Germany
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Exhibition for Textile Machines
25 - 28 Nov 2019
Shanghai, China
Visit us at booth W2 D17!

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Exhibition for Nonwovens
11 - 13 Dec 2019
Shanghai, China
Visit us at booth 1A26!


Mahlo GmbH + Co. KG • Donaustraße 12 • 93342 Saal /Donau
Tel.: +49-9441-601-0 •