5.3.1 Method
A standard system includes image recognition, image processing and a control unit. The sensor unit is a metal structure designed to fit easily into an extruding line. It is equipped with a lighting system for homogeneous illumination of the entire surface of the product. Three CCD array cameras, offset at 120°, watch the running product and transfer data to the processor unit. The recognise smallest defects such as pinholes, changes of colour, neckdowns, lumps...

SIMAC®

5.3.2. Advantages
The system analyses more than 2000 images per second. The smallest faults are caught, even with high-speed lines, irrespective of their location on the product. Each picture of a fault can be stored. These pictures can be displayed and analysed later, e.g. during a night shift.

5.4.1. Method
The highly sophisticated optical system of the KW 32 Trio generates 3 thin light beams at 120° in a common measuring plane. The three detectors that simultaneously receive the light register its smallest variations due to faults on the product.

KW 32 TRIO

5.4.2. Advantages
Versatile installation possibilities, detailed fault logging and insensitivity to external light. Very simple operation and designed for many years of use.
A further development of a well-known technology; has been reliably operating for decades.

Conclusion
The impressive advances in the field of data acquisition have led to its splitting according to the ever-increasing number of physical methods. Measurements should always be carried out as close to the extruder as possible. This allows a quick and effective re-centering while shortening the path of the automatic thickness control. Contact with the surface should not cause any unnecessary strain. Today's ultrasonic methods offer a better product quality up to zero-defect without additional investments.