Avoids waste and quality deviations due to unwanted swelling of the extrudate.
The Brabender Swelltest provides high-precision, non-contact measurement of the diameter of objects with a round cross-section and any transparency using a visible, parallel laser beam that continuously measures the diameter of round profiles.
The measuring system is attached to the Swelltest die head by means of an adaptation kit. The distance to the die head can be adjusted between 12 and 50 mm. A red laser beam emitted from the laser diode in the transmitter is converged into a parallel beam by the transmitter lens. This parallel beam passes through the measuring area before it meets a CCD image sensor in the receiver.
During processing, the extrudate runs through the measuring sector. When the laser beam meets the extrudate, its cross-section is interrupted. This interruption projects a shadow with an area proportional to the diameter of the extrudate on the receiver. The one-dimensional CCD image sensor scans and calculates the shadow area from which
the sample dimensions are calculated by the controller.
30 x 300 mm
0.5…10 mm (option: 30 mm)
± 0.03 mm
RS 232C, baud rate 300…9,600 b/s adjustable (option)
Analog voltage output:
visible semiconductor laser beam, wavelength 670 nm
Ambient temp. at sensor:
85…264 VAC, 47…63 Hz