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SECUROMAT SP-F, art of making the invisible visible
26
Aug '08
For foreign part separators, foils or white polypropylene parts are not visible, or casually speaking, invisible. Hence, the problem definition for the Truetzschler Development Team was to make such parts visible.

After careful examination of all pertinent methods it became clear that detection under polarised light is the optimal solution.

The foreign part separator SECUROMAT SP-F has proven itself worldwide for many years. It can safely detect and separate every type of coloured foreign part. Detection is performed by means of colour cameras on an openly needled roll.

Due to the defined peripheral speed of the roll, the speed of the foreign parts is precisely known, thus making it possible to safely separate them from the tuft flow shortly thereafter.

However, to make parts visible in polarised light, it is essential to apply back light. This is not possible when using detection on a roll.

Therefore, it has been necessary to simultaneously develop software that accurately calculates the speed of the foreign parts in the material flow.

After this hurdle had been taken, the machine was realised without any more obstacles. This new foreign part separator is called SECUROPROP SP-FP.

The special 3-CCD colour cameras have also been developed by Truetzschler, solely for this new machine. They have a resolution of more than 2000 pixels.

When using two cameras side by side, this means a resolution of 0,4 mm over the working width of 1600 mm. This guarantees that even small parts are detected.

To ensure that such small parts are safely separated without losing many fibres, the blow-out is performed with 64 individually activatable groups of 3 nozzles each.

A large-size touch screen simplifies operation. In addition to current operating condition, it also shows exact information on type and quantity of separated parts. They are evaluated according to colour and size.

The distribution over the working width is also known. With this information it is easy for the operator to optimise the detection and separation system in a user-specific manner.

Trützschler GmbH & Co KG

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