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Cap strip – the alternative to calenders

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Stefan Kenn, Managing Director of GfA

"The high quality of the drive systems we get from Bruchsal has been key to the great success and longevity of our collaboration with SEW‑EURODRIVE."

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The project at a glance

GfA De Pryck & Co. mbH

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  • Location: Elze (Germany)
  • Industry: Tire industry
  • Application: A cap strip system produces high-quality strips made of rubberized nylon or hybrid threads (cap ply strips)
  • GfA De Pryck & Co. mbH was founded on January 1, 1991, and employed 46 people at 2 sites across Germany in 2018.
  • As a specialist mechanical engineering company, GfA (Gesellschaft für Automatisierungstechnik) is a global supplier of automation technology specializing in the tire industry.
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  • No control cabinet and little wiring work
  • Energy efficiency
  • Compact and lightweight products
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  • Minimal installation time / no need to start up frequency inverters
  • Innovative solutions
  • Precision
  • Reliability
  • Skilled and reliable contacts
  • Energy-efficient solution

Three processes in one system

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A tire is made up of various components. Part of its body consists of various layers of fabric made of nylon, steel and hybrid threads.

A cap strip system produces high-quality cap ply strips. Cap ply strips are strips of made rubberized nylon or hybrid threads. The GfA cap strip system is a revolutionary development in tire manufacturing. The cap strip system combines three processes in a single system.

Benefits of producing strips with a cap strip system:

  • Fewer joints/imbalances than with tires produced with fabric.
  • The strips are produced without splicing (when processing rolls in a mini slitter, the rolls are joined with a splice after approximately 600 m, which results in inconsistencies such as overlapping, imbalances and joints).
  • The cap strip system combines three processes in a single system.
  • Free capacity on the calender for e.g. steel cord – reduced conversion time and costs (steel – nylon).
  • More flexible production.
  • The Cap Strip produces without side-cut cords. When cutting in the Mini-Slitter it is not always possible to cut between the cords. The consequence would be that the cords would be cut left and/or right. As a result, the stripes on the left and/or right are not covered in rubber, which leads to problems when unwinding.
  • When using the calender-slitter process, coating problems can arise in all three machines. During calendering, the coated fabric is wound up with fabric liners. The fabric is then unwound in the maxi slitter and rewound (without liners) onto a roll 120 mm wide. Unwinding these rolls in the mini slitter can frequently result in sticking (penetration) or detached layers, which can cause further problems when cutting and even winding up the strips.
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