Orthofact RMB-15

Automatic pin wheel straightening system

Removing irregular distortions

Asymmetrical distortions (wavy, S-shaped, etc.) in textiles have always represented a huge challenge in the textile industry. A special straightening approach is needed particularly when the straightening process does not take place in combination with a stenter (e.g. before decatizers, digital printing systems, etc.).

To restore the warp and weft threads to their original state, the Orthofact RMB generates a defined lateral tension using freewheeling, inclined pin wheels. This cross-tension stretches the warp threads. The resultant force controls the freewheeling pin wheels, since the weft threads will always seek out the shortest path from selvedge to selvedge.

Distortion, no matter whether wavy or S-shaped, will be corrected.

Specific Mahlo know-how

The lateral tension is generated with two inclined pin wheels. Two pneumatic cylinders, supplied via a pneumatic line, are used for a consistent straightening effect. To compensate friction losses and tolerances, a spring generates a counterforce which forces the uniform symmetric alignment of the pin wheels. Elaborate lever constructions requiring intensive maintenance can thus be dispensed with.

Special features

  • Unclipping roller with infinitely variable adjustment: Minimises residual bow and edge distortions.
  • Intelligent drive station with special tension control for smallest product tension activates or deactivates automatically (e.g. in case of blockages).
  • A bypass function is available at the push of a button for products that cannot be straightened with the pin wheel.
  • Intelligent wheel following: Product loss is nearly prevented entirely. The control immediately compensates product offset, poor seams, fringes and dents on the edges.
  • Width jump function: New wider products do not need to be pulled in separately when changing products. Sew the new product to the old one, pull in, done! No more downtime!
  • Break function: Reduces the lateral tension to a preselected level when the line is stopped, e.g. during breaks or when working on other machines in the line. Preserves the product!
  • Teflon rollers: On wet fabric teflon-coated feed rollers are used.

Product highlights

  • High lateral tension possible
  • Adjustable unclipping device
  • Bypass function
  • Intelligent drive

Customer benefits

  • The pin wheel straightens even without detection
  • Reliable, quick distortion correction
  • Effective also with asymmetric distortions
  • Less spoilage

Area of application

  • When confronted with asymmetrical distortions (wavy, S-shaped…)
  • For non-elastic fabric that cannot be detected
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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
Visit us!

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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