Orthopac FMC-15

Distortion detection - simply unique

Bow and skew detection

The Orthopac FMC automatic straightener is the heart and core of the Orthopac. The device consists of an optical scanning system and electronic control for distortion correction.

It is used primarily to detect and log residual distortions in the exit end of a system, e.g. with the stenter. Thread density can be determined at the same time. It can also be connected to external straightening machines then serving them as control unit.

Scanning principle according to the modulation principle via Fast Fourier transformation
Scanning principle according to the modulation principle via Fast Fourier transformation

Tracks down distortion in fabric

Skewing of the product during manufacture alters the structure of textile webs. A distorted product depreciates in useful value, affects subsequent processing and invites complaints. 

The integrated optical distortion detection Orthopac FMC  is capable of handling the variety of usual colours, print and Jacquard patterns as well as surface structures such as pile and loop.

The scanning system detects and analyses the regular basic structure of the weft threads, courses or rows of tufting. If necessary, their density is determined at the same time.

Product highlights

  • Broadest scanning spectrum on the market
  • Simple, intuitive operation
  • Automatic scanning even of the most complex product structures

Customer benefits

  • Optimized optics ensure maximum possible resolution of the angle of distortion
  • Direct, instantaneous signal processing determines the angle in a trice
  • Optimized back and incident lighting

Area of application

For the control of various straightening devices, for pull-off rollers, chain differentials and multiple motor drives: The FMC distortion detection Orthopac constitutes the universal automatic straightening system. It can be installed upstream and downstream of a wide variety of production plants.

Equipped with digital scanning and state-ofthe-art processor technology, it adapts the control automatically to different textiles and displays distortion changes ergonomically and conveniently on the screen.


  • Orthopac FMC T: Standard bridge with optical scanning system and two guide rollers
  • Orthopac FMC EP: Compact bridge only with optical scanning system

Additional documents

Orthopac RVMC-15 & FMC-15, Pezzoli, Italy

Installations at Pezzoli Stamperia srl , Italy

Since 1976 Stamperia Pezzoli provides printing and finishing services for semi-finished textiles, operating according to the highest quality standards in every step of the manufacturing process and ensuring a highly competitive service in terms of technology and styling.

All pictures by courtesy of Opens external link in new windowStamperia Pezzoli

Mahlo weftstraightening and process control system at textile finishing
Stenter frame with weft straightener Orthopac RVMC-15 at the feed-end and scanning bridge Orthopac FMC-15 EP at the delivery end. Patcontrol PCS-15 scanning for pattern distortion at the feed- and delivery end. Residual moisture module Textometer RMS and exhaust air moisture module Ecomat AML control the drying processes.
Quality conrol at the outlet of a stenter frame
To log the quality of the fabric after the fixing process, a scanning bridge Orthopac FMC scans for web distortion, a Patcontrol PCS for printing pattern distortion, the Wilot WMR determines the product width and the Textometer RMS the residual moisture. An extensive quality report is generated.
Residual distortion and residual moisture at the stenter outlet
Nice to see on the front left: a measuring roll of the residual moisture measurement Textometer RMS and behind the fabric the counter roll. The electrical conductivity of the web provides the residual moisture. In the background, a headlight of an Orthopac FMC EP scanning bridge for residual distortion measurement subsequent to the fixing in the stenter.
Residual distortion detection with Orthopac FMC
Here the back of the fabric with the scanner for distortion detection. The headlights (transmitted light) sit on the opposite side of the web. The Orthopac FMC at the stenter outlet is often used additionally to a weft straightener on the inlet for quality control and logging. Here a version with manual scanner positioning (recognizable by the snap-in holes on the underside of the guide rail)
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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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Shanghaitex Logo

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 • info@mahlo.com