The Advantages of the Rope Stretch Technology versus Chain Track Systems

The Advantages of the Rope Stretch Technology versus Chain Track Systems
GloBra / K Industries BIAX

Glopinion by

GloBra / K Industries BIAX

Oct 8, 2019

RST offers many advantages compared to traditional Chain Track Systems. Mechanically simple, no sliding oil, much better stretching adjustments and a massive increase in energy efficiency.

A quick overview of the main advantages of RST

1. Mechanically very simple, no sliding oil, less maintenance

As there are no clips or chains or tracks used at all the system is mechanically totally simple and easy to maintain. Guide elements consist of two rollers up and down guiding and a hydraulic system to press the ropes together.


The ropes are made of a very specific fibre only made and built for military purposes. They can be round or square or a combination of round and square depending on the gripping forces needed.

They are extremely durable, can be made endless and can operate under very high temperatures. They can be easily cleaned on the return path.

The system does not need any sliding oil allowing saving cost and keeping the TDO clean. All roller bearings are encaptured in the rollers and not installed on moving parts like the clips.


2. Totally free adjustable stretching

With RST the so-called "Unwanted MD Stretch" when opening the stretch angle cannot happen as the film is gripped continuously by the ropes.

As the guide units of the ropes are mounted on flexible carrier units, any adjustment of stretching be it positive, neutral or even negative can be set in the stretching zone.

This allows a never experienced flexibility of the stretching settings.


3. Energy saving

One of the biggest advantages of the RST is the low construction height allowing to move the nozzles closer to the film.

We have developed a calculation tool allowing us a precise definition of the increase of the heat transfer value and the related energy savings.

In this example, we calculated the effect of moving the nozzles closer to the film by 30 % giving substantial results for better energy efficiency which can be either used for lower energy cost or higher throughput if the TDO with the same energy. We may use this calculation for every line of our customers.

 As can be seen for this line, an 8.2 m BOPP here 20 micron film the increased heat transfer value will reach the needed stretching temperature already after the 6th of nine zones allowing to save energy and/or higher output depending on the film produced and the other parts of the line.


All advantages will be presented at the K fair in Düsseldorf and the already operating testbed can be seen there in a video or visited.

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