VMI’s Extrusion Smearing Technology

VMI Extrusion, together with its skilled technicians and designs, has been part of VMI since 2004. Extrusion is a dedicated business unit of VMI and builds on more than 20 years’ experience with retread cushion-gum extrusion smearing technology, using the lessons learned from the more than 1200 systems containing this technology we have supplied worldwide.

Retreading foto 1

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The RETRAX Program

Now VMI has taken AZ Extrusion technology to the next stage with the RETRAX program. Although based on the continuing development of the AZ Extrusion heritage, but this is a true VMI product, incorporating the commitment to innovation and automation that you would expect from any technology carrying the VMI name.

A true product range

The RETRAX is available in three different types, each with a different extruder capacity.

Each RETRAX type can be delivered in different variations. The basic version being as a cushion gum extruder only. Another version is with a stitching unit and a high speed wheel hub, making the RETRAX suitable for manual pre-cured tread application. The top end version additionally comes with a newly developed fully automatic tread applicator.

The smallest machine in the RETRAX product family.
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Workhorse of the RETRAX family.
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Top of the RETRAX product range.
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Retreading replacement 2

Key benefits

Compared with the more traditional use of calendered cold cushion gum, freshly extruded hot cushion gum application offers the following advantages:

  • Lower cost single size feed strip instead of calendered strip in different widths
  • Better tackiness which reduces or eliminates use of cement sprays, reducing costs and eliminating the fire and health threats caused by these materials

Key features

VMI’s smearing technology cushion application is a major advance on all methods that use extruded strip winding, offering:

  • Automatic skive filling for lower labor costs, while delivering the right quantities of gum on the right spots
  • The smearing principle pushes out the air much better

Thickness of the cushion layer can be controlled by the hub speed and/or extruder speed.

The width is adjusted by movable slides. Wing formers are available for special shoulder and sidewall cushion application.

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